EM78R911 View Datasheet(PDF) - ELAN Microelectronics
Part Name
Description
Manufacturer
EM78R911 Datasheet PDF : 37 Pages
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EM78911
8-bit micro-controller
7. IOCC (LCD DATA)
PAGE0 : Bit7 ~ Bit0 = LCD RAM data register
PAGE1 : 8 bit up-counter (COUNTER2) preset and read out register . ( write = preset) After a interruption , it
will count from “00”.
8. IOCD (Pull-high Control Register)
PAGE0:
7
6
5
4
3
2
1
0
PH7 PH6 PH5 PH4 PH3 PH2 PH1 PH0
* Bit 0 ~ 7 (/PH#) Control bit used to enable the pull-high of PORT7(#) pin.
1: Enable internal pull-high
0: Disable internal pull-high
PAGE1:
7
6
5
4
3
2
1
0
RO7 RO6 RO5 RO4 RO3 RO2 RO1 RO0
* Bit 7 ~ 0 (RO7~0) Control bit used to enable the R-OPTION of PORT97~PORT90 pin.
1: Enable
0: Disable
RO is used for R-OPTION . Setting RO to ‘1’ will enable the status of R-option pin (P90 ~ P97) to read by
controller. Clearing RO will disable R-option function. If the R-option function is used, user must connect
PORT9 pins to GND by 560K external register . If the register is connected/disconnected , the R9 will
read as “ 0/1” when RO is set to ‘1’.
9. IOCE (Bias,PLL Control Register)
PAGE0 :
7
6
5
4
3
2
1
0
P9SH P9SL P6S Bias3 Bias2 Bias1 0
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.
13
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