Port B (Pb.0-Pb.3); Port B Configuration - Oki ML63611 User Manual

10.5 Port B (PB.0–PB.3)
The ML63611 has Port B, a 4-bit input/output port.

10.5.1 Port B Configuration

As its I/O port functions, port B has the input mode that can be pull-up resistor input, pull-down resistor input, or
high-impedance input and the output mode that can be P-channel open drain output, N-channel open drain output,
CMOS output, or high-impedance output. These modes are selected by the port B control registers 0/1 (PBCON0,
PBCON1).
An external 0 interrupt is assigned as an external interrupt function. External 0 interrupts are detected through a 4-
bit OR input. Enabling or disabling interrupts can be specified for each bit by the port B interrupt enable register
(PBIE).
The circuit configuration for port B is shown in Figure 10-6.
4
PB.0–PB.3
OPTION A (C): 1.5 V (3.0 V), Without regulator
circuit for LCD bias
V
DD
Output
port
control
V
SS
V
DD
Pull-up/
pull-down
control
V
SS
Figure 10-6 Input /Output Port (Port B) Configuration
Chapter 10 Ports (INPUT, I/O PORT)
PBD
PBDIR
PBCON0
PBCON1
PBMOD
4
4
10 – 11
OPTION B (D): 1.5 V (3.0 V), With regulator
ML63611 User's Manual
Data bus
4
2
TM0OVF
TM1OVF
(from timer
0, 1 circuits)
PB.0–PB.3
(to external interrupt 0
control circuit)
TM0CAP, TM1CAP,
T02CK, T13CK
(to timer 0–3 circuits)
circuit for LCD bias