LAPIS Semiconductor ML610421, User Manual, Page: 276 / 437

ML610Q421/ML610Q422/ML610421 User’s Manual
Chapter 21 Port 4
21 – 6
21.2.4
Port 4 Control Registers
0, 1 (P4CON0, P4CON1)
Address: 0F222H
Access: R/W
Access size: 8/16 bits
Initial value: 00H
7 6 5 4 3 2 1 0
P4CON0 P47C0 P46C0 P45C0 P44C0 P43C0 P42C0 P41C0 P40C0
R/W R/W R/W R/W R/W R/W R/W R/W R/W
Initial value 0 0 0 0 0 0 0 0
Address: 0F223H
Access: R/W
Access size: 8 bits
Initial value: 00H
7 6 5 4 3 2 1 0
P4CON1 P47C1 P46C1 P45C1 P44C1 P43C1 P42C1 P41C1 P40C1
R/W R/W R/W R/W R/W R/W R/W R/W R/W
Initial value 0 0 0 0 0 0 0 0
P4CON0 and P4CON1 are special function registers (SFRs) to select input/output state of the Port 4 pin. The
input/output state is different between input mode and output mode. Input or output is selected by using the P4DIR
register.
[Description of Bits]
•
P47C1-P40C1, P47C0-P40C0 (bits 7-0)
The P47C1 to P40C1 pins and the P47C0 to P40C0 pins are used to select high-impedance output, P-channel open
drain output, N-channel open drain output, or CMOS output in output mode and to select high-impedance input, input
with a pull-down resistor, or input with a pull-up resistor in input mode.
Setting of P47 pin
When output mode is selected
(P47DIR bit = “0”)
When input mode is selected
(P47DIR bit = “1”)
P47C1 P47C0 Description
0 0 High-impedance output (initial value) High-impedance input
0 1 P-channel open drain output Input with a pull-down resistor
1 0 N-channel open drain output Input with a pull-up resistor
1 1 CMOS output High-impedance input
Setting of P46 pin
When output mode is selected
(P46DIR bit = “0”)
When input mode is selected
(P46DIR bit = “1”)
P46C1 P46C0 Description
0 0 High-impedance output (initial value) High-impedance input
0 1 P-channel open drain output Input with a pull-down resistor
1 0 N-channel open drain output Input with a pull-up resistor
1 1 CMOS output High-impedance input
Setting of P45 pin
When output mode is selected
(P45DIR bit = “0”)
When input mode is selected
(P45DIR bit = “1”)
P45C1 P45C0 Description
0 0 High-impedance output (initial value) High-impedance input
0 1 P-channel open drain output Input with a pull-down resistor
1 0 N-channel open drain output Input with a pull-up resistor
1 1 CMOS output High-impedance input