LAPIS Semiconductor ML610421, User Manual, Page: 275 / 437

ML610Q421/ML610Q422/ML610421 User’s Manual
Chapter 21 Port 4
21 – 5
21.2.3 Port 4 Direction Register (P4DIR)
Address: 0F221H
Access: R/W
Access size: 8 bits
Initial value: 00H
7 6 5 4 3 2 1 0
P4DIR P47DIR P46DIR P45DIR P44DIR P43DIR P42DIR P41DIR P40DIR
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
P4DIR is a special function register (SFR) to select the input/output mode of Port 4.
[Description of Bits]
•
P47DIR-P40DIR (bits 7-0)
The P47DIR to P40DIR pins are used to set the input/output direction of the Port 4 pin.
P47DIR Description
0 P47 pin: Output (initial value)
1 P47 pin: Input
P46DIR Description
0 P46 pin: Output (initial value)
1 P46 pin: Input
P45DIR Description
0 P45 pin: Output (initial value)
1 P45 pin: Input
P44DIR Description
0 P44 pin: Output (initial value)
1 P44 pin: Input
P43DIR Description
0 P43 pin: Output (initial value)
1 P43 pin: Input
P42DIR Description
0 P42 pin: Output (initial value)
1 P42 pin: Input
P41DIR Description
0 P41 pin: Output (initial value)
1 P41 pin: Input
P40DIR Description
0 P40 pin: Output (initial value)
1 P40 pin: Input