EM78P451WM datasheet(7/54 Pages) EMC

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EM78P451

8-Bit Microcontroller with OTP ROM

Product Specification (V1.1) 06.30.2003

• 3

(This specification is subject to change without further notice)

Table 1 Pin description

Symbol

Pin No.

Type

Function Description

R-OSCI

■ In XTAL mode: Crystal input; In internal C, external R mode: 56Kohm

±5% pull

high for 1.8432MHz.

OSCO

■ In XTAL mode: Crystal output; In RC mode: Instruction clock output.

P90~P95

5~10

I/O

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

P90 and P91 are pin-change wake up pins.

P80~P87

19~26

I/O

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

P80 and P81 are also used as the R-option pins.

P70~P72

37~35

I/O

■ LED direct-driving pin with internal serial resistor used as output and is software

defined.

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.

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 individually 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

ohms.

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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