EM73P361A
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
• Capacitor divider
• Resistor divider
1.5V
V
EE
VA
VB
V
EE
VA
VB
0.1F
VDD
VDD
3V
3V
V
SS
V
SS
LCD DISPLAY OPERATION
The LCD programming method is I/O mapping and P10~P12 are must be used.
Address register of LCD display buffer
It is a 5-bit register to specify address for LCD display buffer.
Port11
3
Port10
3
2
1
0
2
1
0
Initial value :0000 0000
A4
A3 A2 A1 A0
Data register of LCD display buffer
P12 is a 3-bit data register to read or write LCD display buffer.
Port12
3
2
1
0
Initial value : 0000
D2 D1 D0
TONE GENERATOR
EM73P361A has a built-in tone generator. It is a binary down counter. When the CPU is reseted or sleeping, the
generator is disabled and the output (P4.0/TONE) is high.
tone
P30.0
P23, P24
fo
Tone
TONE
XIN
generator
High
Output
control
TONE
Tone generator command register
Port30
3
2
1
0
*
*
*
SM
Initial value : 0000
SM Sound generator mode
0
1
Tone generator disable
Tone generator enable
* This specification are subject to be changed without notice.
12.17.2001
19
ELAN [ ELAN MICROELECTRONICS CORP ]
