EM78452WM datasheet(7/54 Pages) EMC

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EM78452

8-Bit Microcontroller

Product Specification (V1.0) 10.18.2007

• 3

(This specification is subject to change without further notice)

Pin Description

Symbol

Pin No.

Type

Function Description

P50~P57

11~18

I/O

8-bit bidirectional general-purpose I/O port. All of its pins can be

pulled-high individually by software.

P60~P67

27~34

I/O

8-bit bidirectional general-purpose I/O port. All of its pins can be

pulled-high by software, and pin-change wake-up pins.

P70~P72

37~35

I/O

LED direct-driving pins with internal serial resistor used as

output and is software defined.

P80~P87

19~26

I/O

8-bit bidirectional general-purpose I/O port. All of its pins can be

pulled-high by software. P80 and P81 are also used as R-option

pins.

P90~P95

5~10

I/O

6-bit bidirectional general-purpose I/O port. All of its pins can be

pulled-high by software. P90 and P91 are pin-change wake-up

pins.

P70/

RESET

I/O

LED direct-driving pin with internal serial resistor used as output

and is software defined.

Code option Bit 3 (REN): reset enable

REN=0

→ for reset pin

REN=1

→ for general purpose I/O (P70)

Internal pull high resistor 220K

R-OSCI

Crystal input

OSCO

Crystal output

CLK

I/O

By connecting P74 and P76 together, P74 can be pulled-high

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

P76 can be defined as an open-drain output.

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.

VDD

−

Power supply pin

VSS

−

Ground pin

/INT

Interrupt Schmitt trigger pin.

The interrupt function is triggerred at a falling edge.

Users can enable it by software.

SRDY

I/O

Slave Ready pin for SPI

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

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