參數(shù)資料
型號: EM78P860
廠商: ELAN Microelctronics Corp .
英文描述: 8 -BIT MICRO-CONTROLLER
中文描述: 8位微控制器
文件頁數(shù): 11/26頁
文件大?。?/td> 191K
代理商: EM78P860
* This specification is subect tobechanged wthout noice
4.17.2000
EM78P860
8 -BIT MICRO-CONTROLLER
11
8.
IOCE
(Bais, PLL Control Register)
PAGE0:
7
6
5
4
3
2
1
0
0
P9SH
P9SL
P6S
Bias3
Bias2
Bias1
SC
Bit 0 :SC (SCAN KEY signal ) 0/1 = disable/enable. Once you enable this bit , all of the LCD signal will have
a low pulse during a common period. This pulse has 30us width. Please use the procedure to implement the
key scan function.
a.
set port7 as input port
b.
set IOCD page0 port7 pull high
c.
enable scan key signal
d.
Once push a key . Set RA(6)=1 and switch to normal mode.
e.
Blank
LCD. Disable scan key signal.
f.
Set P6S =0. Port6 sent probe signal to port7 and read port7. Get the key.
g.
Note!! A probe signal should be delay a instruction at least to another probe signal.
h.
Set P6S =1. Port6 as LCD signal. Enable LCD.
P63
P62
P61
P60
KEY5
KEY1
KEY2
KEY3
KEY4
P73
P72
P71
P70
Fig. 8 Key scan circuit
VDD
V1
V2
V3
V4
VLCD
GND
VDD
V1
V2
V3
V4
VLCD
GND
30
μ
s
seg
com2
Fig. 9 Key scan signal
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