EM78451AP datasheet(7/54 Pages) EMC

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EM78451

8-Bit Microcontroller

Product Specification (V1.2) 05.27.2004

• 3

(This specification is subject to change without further notice)

Symbol

Pin No.

Type

Function Description

DATA

I/O

By connecting P75 and P77 together, P75 can be pulled-high by software

and it is also a pin-change wake-up pin.

P77 can be defined as an open-drain output.

P60~P67

27~34

I/O

General bi-directional port. All of its pins can be pulled-high by software,

and pin-change wake-up pins.

P50~P57

11~18

I/O

General bi-directional I/O port. All of its pins can be pulled-high * * by

software.

VDD

Power supply pin.

VSS

Ground pin.

/INT

An interrupt schmitt-triggered pin. The function of interrupt triggers at the

falling edge. Users can enable it by software. The internal pull-up resistor

is around 50K ohm.

SDI

I/O

Serial data in for SPI

SDO

I/O

Serial data out for SPI.

SCK

I/O

Serial clock for SPI.

/SS

I/O

/Slave select for SPI.

FUNCTION DESCRIPTION

IOC5

IOC6

IOC7

IOC8

IOC9

SPI

ENG IN

TM R1

ACC

STACK 1

STACK 2

STACK 3

STACK 4

STACK 5

P C

ROM

Instruction

Decoder

ALU

Interrupt

Control

/INT

RAM

W DT Tim er

Prescaler

O scillator/

Timming

Control

WD T

Tim e-out

R1(TCC)

Sleep

Wake Up

Control

DAT A & CONT ROL BUS

Fig. 2 Functional Block Diagram

EM78451AP Datasheet(PDF) 7 Page - ELAN Microelectronics Corp

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