N80C251TB24 Intel, N80C251TB24 Datasheet

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... Kbytes or without ROM 16-bit Internal Code Fetch 64-Kbyte Extended Stack Space On-chip Data RAM Options: 512-Byte 8-bit, 2-clock External Code Fetch in Page Mode Fast MCS 251 Instruction Pipeline © INTEL CORPORATION 8xC251TB/TQ Commercial/Express User-selectable Configurations: — External Wait States (0-3 wait states) ® 51 — ...

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... Intel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. Intel products are not intended for use in medical, life saving, or life sustaining applications. Intel may make changes to specifications and product descriptions at any time, without notice ...

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REVISION HISTORY: Date Revision November 1997 December 2003 001 Initial release of this document 002 Removed references to 8XC251TA, 8XC251TP Description iii ...

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iv ...

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HIGH-PERFORMANCE CHMOS Microcontroller 1.0 INTRODUCTION ......................................................................................................................................... 1 2.0 NOMENCLATURE ...................................................................................................................................... 2 3.0 PINOUT ....................................................................................................................................................... 4 4.0 SIGNALS ..................................................................................................................................................... 8 5.0 ADDRESS MAP .........................................................................................................................................11 6.0 ELECTRICAL CHARACTERISTICS ......................................................................................................... 12 6.1 D.C. Characteristics ........................................................................................................................... 12 6.2 Definition of AC Symbols ................................................................................................................... 14 ...

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Contents FIGURES Figure 1. 8xC251TB/TQ Block Diagram.................................................................................................... 1 Figure 2. The 8xC251TB/TQ Family Nomenclature .................................................................................. 2 Figure 3. 8xC251TB/TQ 44-pin PLCC Package........................................................................................ 4 Figure 4. 8xC251TB/TQ 40-pin PDIP Packages ....................................................................................... 5 Figure 5. External Bus Cycle: Code Fetch (Nonpage Mode) ...

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... INTRODUCTION A member of the Intel family of 8-bit MCS 251 micro- controllers, the 8xC251TB/TQ compatible with MCS 51 microcontrollers and pin compatible with 40-pin PDIP and 44-pin PLCC MCS 51 microcontrollers. MCS 251 microcontrollers Figure 1. 8xC251TB/TQ Block Diagram System Bus and I/O Ports P0.7:0 P2 ...

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... XX Description Commercial operating temperature range (0°C to 70°C) with Intel standard burn-in. T Express operating temperature range (-40°C to 85°C) without Intel standard burn-in. N 44-pin Plastic Leaded Chip Carrier (PLCC) P 40-pin Plastic Dual In-line Package (PDIP) C 40-pin Ceramic Dual In-line Package (Ceramic DIP) ...

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Table 2 lists the proliferation options. See 80C251TB24 80C251TQ24 83C251TB24 Table lists the 8xC251TB/TQ package definitions. Pkg 8xC251TB/TQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER Figure 2 for the 8xC251TB/TQ family nomenclature. Table 2. Proliferation Options 8xC251TB/TQ (0 – 24 MHz; ...

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HIGH-PERFORMANCE CHMOS MICROCONTROLLER 3.0 PINOUT P1.5 / CEX2 P1.6 / CEX3 / WAIT# P1.7 / CEX4 / A17 / WCLK P3.0 / RXD P3.1 / TXD P3.2 / INT0# P3.3 / INT1 Figure ...

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HIGH-PERFORMANCE CHMOS MICROCONTROLLER P1 P1.1 / T2EX 2 P1.2 / ECI / RXD1 3 P1.3 / CEX0 / TXD1 4 P1.4 / CEX1 5 8XC251TB P1.5 / CEX2 6 8XC251TQ P1.6 / CEX3 / WAIT# 7 ...

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HIGH-PERFORMANCE CHMOS MICROCONTROLLER Table 4. 8xC251TB/TQ Pin Assignment PLCC DIP Name 1 V SS1 2 1 P1.0/ P1.1/T2EX 4 3 P1.2/ECI/RXD1 5 4 P1.3/CEX0/TXD1 6 5 P1.4/CEX1 7 6 P1.5/CEX2 8 7 P1.6/CEX3/WAIT P1.7/CEX4/A17/WCLK 10 ...

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HIGH-PERFORMANCE CHMOS MICROCONTROLLER Table 5. 8xC251TB/TQ PLCC/DIP Pin Assignments Arranged by Functional Category Address & Data Name PLCC AD0/P0.0 43 AD1/P0.1 42 AD2/P0.2 41 AD3/P0.3 40 AD4/P0.4 39 AD5/P0.5 38 AD6/P0.6 37 AD7/P0.7 36 A8/P2.0 24 A9/P2.1 25 A10/P2.2 ...

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HIGH-PERFORMANCE CHMOS MICROCONTROLLER 4.0 SIGNALS Table 6. Signal Descriptions (Sheet Signal Type Name A17 O 18th Address Bit (A17). Output to memory as 18th external address bit (A17) in extended bus applications, depending on the values ...

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Table 6. Signal Descriptions (Sheet Signal Type Name RD# O Read or 17th Address Bit (A16). Read signal output to external data memory or 17th external address bit (A16), depending on the values of bits RD0 and ...

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HIGH-PERFORMANCE CHMOS MICROCONTROLLER Table 6. Signal Descriptions (Sheet Signal Type Name WAIT# I Real-time Wait State Input. The real-time WAIT# input is enabled by writing a logical ‘1’ to the WCON.0 (RTWE) bit at S:A7H. During ...

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ADDRESS MAP Internal Address) FF:FFFFH External Memory except the top eight bytes (FF:FFF8H–FF:FFFFH) which are reserved for the configuration array. FF:4000H FF:3FFFH External memory or on-chip nonvolatile memory (8Kbytes FF:0000H - FF:1FFFH, 16Kbytes FF:0000H - FF:3FFFH). FF:0000H FE:FFFFH External ...

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... OH (Port ALE, PSEN#) 12 NOTICE:This document contains information on products being sampled or in the initial production phase of development. Verify with your local Intel sales office that you have the latest datasheet ... -0 +6 before finalizing a design. WARNING: Stressing the device beyond the “Absolute Maximum Ratings” may cause permanent damage. These are stress ratings only. Operation beyond the “ ...

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Table 9. DC Characteristics at V Symbol Parameter V Output High Voltage OH1 (Port 0 in External Address) V Output High Voltage OH2 (Port 2 in External Address during Page Mode) I Logical 0 Input IL Current (Port 1, 2, ...

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HIGH-PERFORMANCE CHMOS MICROCONTROLLER 6.2 Definition of AC Symbols Table 10. AC Timing Symbol Definitions Signals Conditions A Address H High D Data In L Low L ALE V Valid Q Data Out X No Longer Valid R RD#/PSEN# Z ...

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Table 11. AC Characteristics (Sheet Symbol Parameter T ALE Low to RD# or PSEN# LLRL Low @ 16MHz @ 24MHz T ALE Low to RD# or PSEN# LLRLA Low @ 16MHz @ 24MHz T ALE High to ...

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HIGH-PERFORMANCE CHMOS MICROCONTROLLER Table 11. AC Characteristics (Sheet Symbol Parameter T RD# or PSEN# High to ALE RHLH2 High (data) @ 16MHz @ 24MHz T RD# or PSEN# High to ALE RHLH2A High (data) @ 16MHz ...

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Table 11. AC Characteristics (Sheet Symbol Parameter T Address (mux’d) Valid to AVWL1 WR# Low @ 16MHz @ 24MHz T Address (mux’d) Valid to AVWL1A WR# Low @ 16MHz @ 24MHz T Address (demux’d) Valid to AVWL2 ...

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HIGH-PERFORMANCE CHMOS MICROCONTROLLER 6.3.1 External Bus Cycles, Nonpage Mode XTAL1 ALE RD#/PSEN# P0 P2/A16/A17 † The value of this parameter depends on wait states. See the table of AC characteristics. Figure 5. External Bus Cycle: Code Fetch (Nonpage Mode) ...

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HIGH-PERFORMANCE CHMOS MICROCONTROLLER XTAL1 ALE T LHLL † RD#/PSEN# T AVLL † AVRL † P2/A16/A17 † The value of this parameter depends on wait states. See the table of AC characteristics. Figure 6. External Bus Cycle: Data ...

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HIGH-PERFORMANCE CHMOS MICROCONTROLLER XTAL1 ALE T LHLL † WR# T AVLL † AVWL2 † P2/A16/A17 † The value of this parameter depends on wait states. See the table of AC characteristics. Figure 7. External Bus Cycle: Data ...

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External Bus Cycles, Page Mode XTAL1 ALE T LHLL † RD#/PSEN# T AVLL † P2 P0/A16/A17 † The value of this parameter depends on wait states. See the table of AC characteristics. †† A page hit (i.e., a code ...

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HIGH-PERFORMANCE CHMOS MICROCONTROLLER XTAL1 ALE T LHLL † T LLRL † RD#/PSEN# P2 P0/A16/A17 † The value of this parameter depends on wait states. See the table of AC characteristics. Figure 9. External Bus Cycle: Data Read (Page Mode) ...

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HIGH-PERFORMANCE CHMOS MICROCONTROLLER XTAL1 ALE T LHLL † WR# T LHAX † T AVLL † AVWL1 † T AVWL2 † P0/A16/A17 † The value of this parameter depends on wait states. See the table of AC characteristics. ...

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HIGH-PERFORMANCE CHMOS MICROCONTROLLER 6.3.3 Definition of Real-Time Wait Symbols Table 12. Real-time Wait Timing Symbol Definitions Signals A Address D Data C WCLK Y WAIT# W WR# R RD#/PSEN# 6.3.4 External Bus Cycles, Real-Time Wait States WCLK ALE RD#/PSEN# ...

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HIGH-PERFORMANCE CHMOS MICROCONTROLLER State 1 WCLK ALE WR# T max WLYX T min WLYX T WLYV WAIT# P0 A7:0 P2 Figure 12. External Bus Cycle: Data Write (Nonpage Mode) State 2 State 3 T min CLYX T max CLYX ...

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HIGH-PERFORMANCE CHMOS MICROCONTROLLER State 1 WCLK ALE RD#/PSEN# T RLYX T RLYX WAIT# P2 A15:8 P0 Figure 13. External Bus Cycle: Code Fetch/Data Read (Page Mode) 26 State 2 State 3 T min CLYX T CLYV RD#/PSEN# max min ...

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State 1 WCLK ALE WR# T max WLYX T min WLYX T WLYV WAIT# P2 A15:8 P0 Figure 14. External Bus Cycle: Data Write (Page Mode) Table 13. Real-Time Wait AC Timing Symbol Parameter T Wait Clock Low to Wait ...

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HIGH-PERFORMANCE CHMOS MICROCONTROLLER 6.4 AC Characteristics — Serial Port, Shift Register Mode Table 14. Serial Port Timing — Shift Register Mode Symbol Parameter T Serial Port Clock Cycle Time XLXL T Output Data Setup to Clock Rising Edge QVSH ...

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External Clock Drive Symbol Parameter 1/T Oscillator Frequency (F CLCL T High Time CHCX T Low Time CLCX T Rise Time CLCH T Fall Time CHCL V – 0 0.2 V – 0.1 0.45 V ...

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... THERMAL CHARACTERISTICS All thermal impedance data is approximate for static air conditions at 1 watt of power dissipation. Values change depending on operating conditions and application requirements. The Handbook (order number 240800) describes Intel’s thermal impedance test methodology. Table 16. Thermal Characteristics Package Type JA 44-pin PLCC 46° ...