Technical information

17
MITSUBISHI MICROCOMPUTERS
3820 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Fig. 7 Port block diagram (3)
(17) Port P7 0
Data bus
Direction register
Port latch
Port selection/Pull-up control
Port X
C switch bit
Oscillation circuit
Port P71
Port XC switch bit
V
L3
VL2
VL1
(19) COM 0 –COM 3
The gate input signal of each transistor is
controlled by the LCD duty ratio and the
bias value.
VSS
(18) Port P7 1
Data bus
Direction register
Port latch
Port X
C switch bit
Port selection/Pull-up control
Sub-clock generating circuit input
(20) SEG 0 – SEG 15
The voltage applied to the sources of
P-channel and N-channel transistors
is the controlled voltage by the bias
value.
VL2/VL3
VL1/VSS