EM73P461A
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
(3) 1/4 duty (1/2 bias)
(5) 1/2 duty (1/2 bias)
(6) static
(4) 1/3 duty (1/2 bias)
V
DD
V3
V2
V1
V
DD
V3
V2
V1
V
DD
V3
V2
V1
V
DD
V3
V2
V1
3V
3V
3V
3V
1.5V
1.5V
1.5V
1.5V
VA
VB
VA
VB
VA
VB
VA
VB
V
SS
V
SS
V
SS
V
SS
V3
Vss
V3
V1
Vss
V3
V1
Vss
V3
V1
Vss
COM0
COM1
COM2
V3
V1
Vss
V3
V1
Vss
V3
V1
Vss
V3
V1
Vss
V3
V1
Vss
V3
V1
Vss
COM3
SEG0
ON
OFF
V3
V1
Vss
V3
V1
Vss
V3
V1
Vss
V3
V1
Vss
V3
V1
Vss
-V1
-V3
V3
V3
V1
Vss
-V1
-V3
SEG0-COM0
ON
V3
V1
Vss
-V1
-V3
Vss
-V3
V3
V3
V1
Vss
-V1
-V3
V3
V1
Vss
-V1
-V3
SEG0-COM1
OFF
V3
V1
Vss
-V1
-V3
Vss
-V3
Frame
Frame
Frame
Frame
RESETTING FUNCTION
When CPU in normal working condition and RESET pin holds in low level for three instruction cycles at least,
then CPU begins to initialize the whole internal states, and when RESET pin changes to high level, CPU begins
to work in normal condition.
The CPU internal state during reset condition is as following table :
Hardware condition in RESET state
Program counter
Initial value
0000h
Status flag
01h
Interrupt enable flip-flop ( EI )
MASK0 ,1, 2, 3
00h
00h
Interrupt latch ( IL )
P10, 11,14, 16, 19, 25, 27, 28, 29, 31
P4, 8, 23, 24
00h
00h
0Fh
Both oscillator
Start oscillation
The RESET pin is a hysteresis input pin and it has a pull-up resistor available by mask option.
The simplest RESET circuit is connect RESET pin with a capacitor to VSS and a diode to VDD.
RESET
* This specification are subject to be changed without notice.
12.27.2001
25
ELAN [ ELAN MICROELECTRONICS CORP ]
