EM78869 Datasheet, PDF (19/38 Pages) ELAN Microelectronics Corp – 8-Bit RISC Type Microprocessor

EM78869
8-Bit RISC Type Microprocessor
Page 1 (Counter 1 Preset Register)
Bit 7
C1D7
Bit 6
C1D6
Bit 5
C1D5
Bit 4
C1D4
Bit 3
C1D3
Bit 2
C1D2
Bit 1
C1D1
Bit 0
C1D0
Bit 0 ~7: (C1D0~C1D7) 8 bit up counter (COUNTER1) preset and read out register
(write = preset ). After an interruption, it will count from “0”.
6.2.10 IOCC (LCD Data, Counter 2)
Page 0 (LCD Data)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
LCDD7 LCDD6 LCDD5 LCDD4 LCDD3
Bit 0 ~7: (LCDD0~LCDD7) LCD RAM data register
Bit 2
LCDD2
Bit 1
LCDD1
Bit 0
LCDD0
Page 1 (Counter 2)
Bit 7
C2D7
Bit 6
C2D6
Bit 5
C2D5
Bit 4
C2D4
Bit 3
C2D3
Bit 2
C2D2
Bit 1
C2D1
Bit 0
C2D0
Bit 0 ~7: (C2D0~C2D7) 8 bit up-counter (COUNTER2) preset and read out register. (Write =
preset). After an interruption, it will count from “00”.
6.2.11 IOCD (Pull-High Control Register)
Bit 7
PH77
Bit 6
PH76
Bit 5
PH75
Bit 4
PH74
Bit 3
PH73
Bit 2
PH72
Bit 1
PH71
Bit 0
PH70
Bit 0 ~7: (PH70~PH77) Control bit is used to enable the pull-high of Port 7 (#) pin.
0: Disable internal pull-high register
1: Enable internal pull-high register
6.2.12 IOCE (Bias Control Register)
Page 0 (Port9 GPIO/LCD Segment, Port6 GPIO/LCD Com, LCD Bias,
Scan Key Signal Control Register)
Bit 7
P9SH
Bit 6
P9SL
Bit 5
P6S
Bit 4
BIAS3
Bit 3
BIAS2
Bit 2
BIAS1
Bit 1
0
Bit 0:
(SC) Scan key signal.
0: Disable scan key signal
1: Enable scan key signal
Bit 0
SC
Once you enable this bit, all of the LCD signal will have a low pulse during a common period.
This pulse has 30µs width. Use the following procedures to implement the key scans
function:
a) Set Port7 as input port
b) Set IOCD Page 0 Port 7 to pull high
c) Enable scan key signal
d) Once a key is pressed, set RA (6)=1, and switch to normal mode
e) Blank LCD. Disable scan key signal
This specification is subject to change without further notice.
07.12.2004 (V1.0) 15 of 34