EM73PA88A
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
P22
P14
3
*
2
1
0
Initial value : 0000
SOM
SOM
0 0 0
1 * *
Select operation mode
DUAL operation mode
SLOW operation mode
3
*
2
1
0
Initial value : *000
WKS LFS CPUS
LFS
0
1
Low-frequency status
LXIN source is not stable
LXIN source is stable
CPUS
0
1
CPU status
DUAL operation mode
SLOW operation mode
WKS
Wakeup status
0
1
Wakeup not by internal timer
Wakeup by internal timer
Port14 is the status register for CPU. P14.0 (CPU status) and P14.1 (Low-frequency status) are read-only
bits. P14.2 (wakeup status) will be set as "1" when CPU is waked by internal timer. P14.2 will be cleared as
"0" when user out data to P14.
IDLE OPERATION MODE
The IDLE operation mode suspends all CPU functions except the low-frequency clock oscillation and the
LCD driver. It keeps the internal status with low power consumption without stopping the slow clock
oscillator and LCD display.
LCD display is available for the IDLE operation mode. Sound generator is disabled in this mode. The IDLE
operation mode will be wakeup and return to the SLOW operation mode by the internal timing generator or
I/O pins (P0(0..3)/WAKEUP 0..3 and P8(0..3)/WAKEUPA..D).
P19
3
2
1
0
Initial value : 0000
*
IDME
SIDR
IDME
Enable IDLE mode
Enable IDLE mode
no function
SIDR
0 0
0 1
1 0
1 1
Select IDLE releasing condition
P0(0..3), P8(0..3) pin input
P0(0..3), P8(0..3) pin input and 1 sec signal
P0(0..3), P8(0..3) pin input and 0.5 sec signal
P0(0..3), P8(0..3) pin input and 15.625 ms signal
1
0
STOP OPERATION MODE
The STOP operation mode suspends system operation and holds the internal status immediately before the
suspension with low power consumption. This mode will be released by reset or I/O pins (P0(0..3)/
WAKEUP 0..3 and P8(0..3)/WAKEUP A..D).
LCD display and sound generator are disabled in the STOP operation mode.
* This specification are subject to be changed without notice.
10.8.2001
18
ELAN [ ELAN MICROELECTRONICS CORP ]
