EM78862C 查看數據表（PDF） - ELAN Microelectronics

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产品描述 (功能)

生产厂家

EM78862C

8-Bit Microcontroller

ELAN Microelectronics 

EM78862C

8-Bit RISC Type Microprocessor

f) Set P9SL = 0, P9SH = 0. Port9 sends probe signal to Port7 and

read Port7 to get the key. Note that a probe signal instruction

delay will occur before the next instruction is performed.

g) Set P9SH = 1, P9SL = 1. Define Port9 as LCD signal and

enable LCD.

P93

P92

P91

P90

Com 2

Seg

KEY5 KEY1

KEY2

KEY3

KEY4

P73 P72 P71

Fig. 6 Scan Key Circuit

P70

VDD

V1

V2

V3

VLCD

GND

VDD

V1

V2

V3

VLCD

GND

30盜

Fig. 7 Key Scan Waveform

14 •

Product Specification (V2.1) 07.13.2005

(This specification is subject to change without further notice)

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