EM78P447SAM datasheet(17/55 Pages) EMC

tên linh kiện	EM78P447SAM

Giải thích chi tiết về linh kiện	8-BIT MICRO-CONTROLLER

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EM78P447S

OTP ROM

4.4 I/O Ports

The I/O registers, Port 5, Port 6, and Port 7, are bi-directional tri-state I/O ports. The functions of Pull-high, R-option, and

Open-drain can be performed internally by CONT and IOCE respectively. There is input status change wake-up function on

Port 6, P74, and P75. Each I/O pin can be defined as "input" or "output" pin by the I/O control register (IOC5 ~ IOC7). The

I/O registers and I/O control registers are both readable and writable. The I/O interface circuits for Port 5, Port 6, and Port

7 are shown in Figures. 7(a) and (b) respectively.

PDRD

CLK

PCWR

PDWR

CLK

PORT

IOD

PCRD

Fig. 7 (a) The I/O Port and I/O Control Register Circuit

PDRD

CLK

PCWR

PDWR

CLK

IOD

ROC

VCC

Weakly

Pull- up

PORT

Rex*

*The Rex is 430K ohm external resistor

PCRD

Fig.7(b) The I/O Port with R-Option (P70, P71) Circuit

This specification is subject to change without prior notice.

06.25.2003 (V1.1)

EM78P447SAM bảng dữ liệu(PDF) 17 Page - ELAN Microelectronics Corp