3069RF-ZTAT Datasheet, PDF (309/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

Port 9 Data Register (P9DR): P9DR is an 8-bit readable/writable register that stores output data
for port 9. When port 9 functions as an output port, the value of this register is output. When a bit
in P9DDR is set to 1, if port 9 is read the value of the corresponding P9DR bit is returned. When a
bit in P9DDR is cleared to 0, if port 9 is read the corresponding pin logic level is read.
Bits 7 and 6 are reserved. They are fixed at 1, and cannot be modified.
Bit
Initial value
Read/Write
7
6
—
—
1
1
—
—
Reserved bits
5
P9 ₅
0
R/W
4
P9 ₄
0
R/W
3
P9 ₃
0
R/W
2
P9 ₂
0
R/W
1
P9 ₁
0
R/W
Port 9 data 5 to 0
These bits store data
for port 9 pins
0
P9 ₀
0
R/W
P9DR is initialized to H'C0 by a reset and in hardware standby mode. In software standby mode it
retains its previous setting.
Rev. 5.0, 09/04, page 287 of 978