T80C251TB データシートの表示（PDF） - Intel

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T80C251TB

HIGH-PERFORMANCE CHMOS MICROCONTROLLER

Intel 

8xC251TB/TQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER

1.0 INTRODUCTION

A member of the Intel family of 8-bit MCS 251 micro-

controllers, the 8xC251TB/TQ is binary-code

compatible with MCS 51 microcontrollers and pin

compatible with 40-pin PDIP and 44-pin PLCC

MCS 51 microcontrollers. MCS 251 microcontrollers

feature an enriched instruction set, linear

addressing, and efficient C-language support. The

8xC251TB/TQ has 512 bytes or 1 Kbyte of on-chip

RAM and is available with 8 Kbytes or 16 Kbytes of

on-chip ROM, or without ROM. A variety of features

can be selected by new user-programmable configu-

rations.

Figure 1. 8xC251TB/TQ Block Diagram

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

Two

Serial I/O

Ports

Peripherals

DST (16)

MCS® 251 Microcontroller Core

Clock & Reset

B2976-01

1

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