EM73P362
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
LCD DISPLAY DATA AREA
The LCD display data is stored in RAM from address 40h ~ 46h, 50h ~ 56h and 60h ~ 66h. The relation of
data area and COM / SEG pin is as below :
Address Increment
bit 0 1 2 3 0 1 2
40h~46h (COM0)
50h~56h (COM1)
60h~66h (COM2)
Read automatically by the display data from the display data area and send to the LCD driver by the
hardware. Therefore, the display patterns can be changed only by overwritting the contents of the display
data area with the software.
The relation between LCD display RAM and driving method
Driving method LCD display RAM address
40h ~ 46h 50h ~ 56h 50h ~ 66h
1/3 duty
1/2 duty
Static
COM0
COM0
COM0
COM1
COM1
-
COM2
-
-
HIGH SPEED COUNTER
EM73P362 has one high speed counter for resistor to frequency oscillation mode, melody mode and auto
load timer mode. The resistor to frequency oscillation (RFO) circuit as show below :
P18(3..2)
Counter
P18(1..0)
MUX
P5
P3
P4.0(RX)
P4.2(RY)
P4.3(RZ)
P4.1(CS)
FRF/2X
Resistor FRF
to
frequency
oscillator
TCB
TONE
8-bit Counter
P17(1..0)
Rate
P17(3..2)
Mode
gating
rate
clock
rate
* This specification are subject to be changed without notice.
11.1.2001
21
ELAN [ ELAN MICROELECTRONICS CORP ]
