80C251 Intel, 80C251 Datasheet - Page 3

• Manufacturer Part Number: 80C251
• Description: Search -----> N80C251
• Manufacturer: Intel

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PRELIMINARY
System Bus and I/O Ports
SRC2 (8)
SRC1 (8)
Code Bus (16)
Drivers
P0.7:0
Port 0
ALU
DST (16)
8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
Instruction Sequencer
Drivers
Memory Data (16)
P2.7:0
Memory Address (16)
Port 2
Bus Interface
Register
File
Figure 1. 8XC251SA/SB/SP/SQ Block Diagram
MCS
8XC251SA/SB/SP/SQ Microcontroller
Code Address (24)
OTPROM/ROM
16 Kbytes
8 Kbytes
®
Interface
Memory
Code
Data
251 Microcontroller Core
or
Peripheral
1024 Bytes
Interface
Data RAM
Interrupt
512 Bytes
Handler
Clock
Reset
or
&
Clock & Reset
Drivers
P1.7:0
Port 1
Peripheral Signals
I/O Ports and
Peripherals
Watchdog
Serial I/O
Counters
Timer/
Timer
PCA
Drivers
P3.7:0
Port 3
A4214-01
3