MITSUBISHI MICROCOMPUTERS
3822 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
(13) Port P5
6
Pul-up control
(14) Port P6
Pull-up control
Direction register
Direction register
Data bus
Port latch
Data bus
Port latch
T
OUT
output control bit
Timer output
A-D conversion input
Analog input pin selection bit
(15) Port P7
0
Port X
C
switch bit + Pull-up control
Port X
C
switch bit
Direction register
(16) Port P7
1
Port X
C
switch bit + Pull-up control
Port X
C
switch bit
Direction register
Data bus
Port latch
Data bus
Port latch
Oscillation circuit
Port P7
1
Port X
C
switch bit
Sub-clock generating circuit input
(17) COM
0
鈥揅OM
3
(18) SEG
0
鈥揝EG
11
V
L2
/V
L3
V
L3
V
L1
/V
SS
V
L2
V
L1
The gate input signal of each transistor is
controlled by the LCD duty ratio and the
bias value.
The voltage applied to the sources of
P-channel and N-channel transistors
is the controlled voltage by the bias
value.
Fig. 17 Port block diagram (3)
21