EM73P361A
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
POWER SAVING FUNCTION ( Sleep / Hold function )
During sleep and hold condition, CPU holds the system's internal status with a low power consumption, for
the sleep mode, the system clock will be stoped in the sleep condition and system need a warm up time for
the stability of system clock running after wakeup . In the other way, for the hold mode, the system clock
does not stop at all and it does not need a warm-up time any way.
The sleep and hold mode is controlled by Port 16 and released by P0(0..3)/WAKEUP0..3.
P16
3
2
1
0
initial value :0000
WM SE
SWWT
WM Set wake-up release mode
0
1
Wake-up in edge release mode
Reserved
SWWT Set wake-up warm-up time
17
SE Enable sleep/hold
0 0
0 1
1 0
1 1
2
2
/XIN
/XIN
/XIN
13
0
1
Reserved
Enable sleep / hold rnode
15
2
Hold mode
Sleep and hold condition:
1. Osc stop ( sleep only ) and CPU internal status held .
2. Internal time base clear to "0".
3. CPU internal memory ,flags, register, I/O held original states.
4. Program counter hold the executed address after sleep release.
Release condition:
1. Osc start to oscillating.(sleep only).
2. Warm-up time passing ( sleep only ).
3. According PC to execute the following program.
There is one kind of sleep/hold release mode .
1. Edge release mode:
Release sleep/hold condition by the falling edge of any one of P0(0..3)/WAKEUP0..3.
Note : There are 4 independent mask options for wakeup function in EM73360. So, the wakeup function
of P0(0..3)/WAKEUP0..3 are enabled or disabled inpendently.
LCD DRIVER
EM73P361A can directly drive the liquid crystal display (LCD) and has 27 segment, 3 common output pins.
There are total 27 x 3 dots can be display. The VDD, VEE and VSS pins are the bias voltage inputs of the LCD
driver. The VA and VB are used to the voltage double for 3V system. The method of LCD programming is
I/O mapping.
CONTROL OF LCD DRIVER
The LCD driver control command register is P27. When LDC is 00, the LCD is disabled. When LDC is 01,
the LCD is blanking,
* This specification are subject to be changed without notice.
12.17.2001
17
ELAN [ ELAN MICROELECTRONICS CORP ]
