HD64F3642AHV Datasheet, PDF (215/551 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 8 I/O Ports
Port Data Register 7 (PDR7)
Bit
7
6
5
4
3
2
1
0
Initial value
P77
P76
P75
P74
P73



0
0
0
0
0
0^*
0^*
0^*
Read/Write
R/W
R/W
R/W
R/W
R/W



Note: * Bits 2 to 0 are reserved; they are always read as 0 and cannot be modified.
PDR7 is an 8-bit register that stores data for port 7 pins P7₇ to P7₃. If port 7 is read while PCR7
bits are set to 1, the values stored in PDR7 are read, regardless of the actual pin states. If port 7 is
read while PCR7 bits are cleared to 0, the pin states are read.
Upon reset, PDR7 is initialized to H'00.
Port Control Register 7 (PCR7)
Bit
7
6
5
4
3
2
1
0
PCR77 PCR76 PCR75 PCR74 PCR73



Initial value
0
0
0
0
0
0
0
0
Read/Write
W
W
W
W
W



PCR7 is an 8-bit register for controlling whether each of the port 7 pins P7₇ to P7₃ functions as an
input pin or output pin. Setting a PCR7 bit to 1 makes the corresponding pin an output pin, while
clearing the bit to 0 makes the pin an input pin.
Upon reset, PCR7 is initialized to H'00.
PCR7 is a write-only register, which always reads as all 1s.
Rev. 6.00 Sep 12, 2006 page 193 of 526
REJ09B0326-0600