LAPIS Semiconductor ML610471, User Manual, Page: 193 / 281

ML610471/472/473/Q471/Q472/Q473 User's Manual
Chapter 15 Port 4
15-5
15.2.3 Port 4 Direction Register (P4DIR)
Address: 0F221H
Access: R/W
Access size: 8-bit
Initial value: 00H
7 6 5 4 3 2 1 0
P4DIR
P47DIR P46DIR P45DIR P44DIR P43DIR P42DIR
⎯ ⎯
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 to P42DIR (bits 7 to 2)
P47DIR to P42DIR are the bits for selecting the input/output mode of the Port 4 pins.
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
Note:
In 48-pin plastic TQFP, P42 pin is not available. Please set P42DIR bit to “0”.