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80C251SA

HIGH-PERFORMANCE CHMOS MICROCONTROLLER

Intel 

8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER

System Bus and I/O Ports

P0.7:0

P2.7:0

Port 0

Drivers

Port 2

Drivers

Code

OTPROM/ROM

8 Kbytes

or

16 Kbytes

Data RAM

512 Bytes

or

1024 Bytes

I/O Ports and

Peripheral Signals

P1.7:0

P3.7:0

Port 1

Drivers

Port 3

Drivers

Memory Data (16)

Memory Address (16)

Bus Interface

Code Bus (16)

Code Address (24)

Instruction Sequencer

SRC1 (8)

Peripheral

Interface

Interrupt

Handler

Watchdog

Timer

Timer/

Counters

PCA

SRC2 (8)

ALU

Register

File

Data

Memory

Interface

Clock

&

Reset

Serial I/O

Peripherals

DST (16)

MCS® 251 Microcontroller Core

Clock & Reset

8XC251SA/SB/SP/SQ Microcontroller

Figure 1. 8XC251SA/SB/SP/SQ Block Diagram

PRELIMINARY

A4214-01

3

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