Rohm LAPIS SEMICONDUCTOR ML620Q503, User Manual

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ML620Q503/Q504 User's Manual
Chapter 20 Port 3
FEUL620Q504 20–9
20.2.4 Port 3 Control Register (P3CON)
Address: 0F22AH
Access: R/W
Access size: 8/16 bit
Initial value: 0000H
7 6 5 4 3 2 1 0
P3CON0
P37C0 P36C0 P35C0 P34C0 P33C0 P32C0 P31C0 P30C0
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
15 14 13 12 11 10 9 8
P3CON1
P37C1 P36C1 P35C1 P34C1 P33C1 P32C1 P31C1 P30C1
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
P3CON0 and P3CON1 are special function registers (SFRs) used to select the output state of the port 3 pin. The
output state is different between input mode and output mode. Input or output is selected by using the P3DIR
register.
Description of Bits
•
P37-30C0 (bits 7 to 0) , P37-30C1 (bits 15-8)
The P37-30C1 and P37-30C0 bits 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.
To perform the direct LED drive, select N-channel open drain output mode.
Setting of P30 pin
When output mode is selected
(P30DIR bit = “0”)
When input mode is selected
(P30DIR bit = “1”)
P30C1 P30C0 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 P31 pin
When output mode is selected
(P31DIR bit = “0”)
When input mode is selected
(P31DIR bit = “1”)
P31C1 P31C0 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