N80C251SQ16 Intel, N80C251SQ16 Datasheet - Page 14

• Manufacturer Part Number: N80C251SQ16
• Description: IC MPU 8-BIT 5V 16MHZ 44-PLCC
• Manufacturer: Intel
• Series: 80Cr

Specifications of N80C251SQ16

• Rohs Status: RoHS non-compliant
• Core Processor: MCS 251
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SIO
• Peripherals: PWM, WDT
• Number Of I /o: 32
• Program Memory Type: ROMless
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-PLCC
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -
• Other names: 804459

14
8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
4.0 ADDRESS MAP
FF:FFFFH
FF:4000H
FF:3FFFH
FF:0000H
FE:FFFFH
FE:0000H
FD:FFFFH
02:0000H
01:FFFFH
01:0000H
00:FFFFH
00:E000H
00:DFFFH
00:0420H
00:041FH
00:0080H
00:007FH
00:0020H
00:001FH
00:0000H
NOTES:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. Eight addresses at the top of all external memory maps are reserved for current and future device
Address)
Internal
18 address lines are bonded out (A15:0, A16:0, or A17:0 selected during chip configuration).
The special function registers (SFRs) and the register file have separate internal address spaces.
Data in this area is accessible by indirect addressing only.
Devices reset into internal or external starting locations depending on the state of EA# and configura-
tion byte information See EA#. See also UCONFIG1:0 bit definitions in the 8XC251SA/SB/SP/SQ
Embedded Microcontroller User’s Manual.
The 16-Kbyte ROM/OTPROM/EPROM devices allow internal locations FF:2000H–FF:3FFFH to map
into region 00:. In this case, if EA# = 1, a data read to 00:E000H–00:FFFFH is redirected to internal
ROM/OTPROM/EPROM (see bit 1 in UCONFIG0). This is not available for 8-Kbyte
ROM/OTPROM/EPROM devices.
This reserved area returns indeterminate values.
Data is accessible by direct and indirect addressing.
Data is accessible by direct, indirect, and bit addressing.
Data is accessible by direct, indirect, and register addressing.
configuration byte information.
External Memory except the top eight bytes (FF:FFF8H–FF:FFFFH) which are
reserved for the configuration array.
External memory or on-chip nonvolatile memory (8Kbytes FF:0000H - FF:1FFFH,
16Kbytes FF:0000H - FF:3FFFH).
External Memory
Reserved
External Memory
External memory or with configuration bit EMAP# = 0, addresses in this range
access on-chip code memory in region FF: (16 Kbyte devices only).
External Memory
On-chip RAM (512 bytes 00:0020H - 00:021FH, 1024 bytes 00:0020H -
00:041FH)
On-chip RAM
Storage for R0–R7 of Register File
Table 8. 8XC251SA/SB/SP/SQ Address Map
Description
PRELIMINARY
1, 3, 10
3, 4, 5
3
6
3
5, 7
7
7
8
2, 9
Notes