SH7055S Datasheet, PDF (751/1002 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

21.5.2 Port D Data Register (PDDR)
Bit: 15
—
Initial value: 0
R/W: R
14
13
12
11
10
9
8
—
PD13 PD12 PD11 PD10 PD9
PD8
DR
DR
DR
DR
DR
DR
0
0
0
0
0
0
0
R
R/W R/W R/W R/W R/W R/W
Bit: 7
6
5
4
3
2
1
0
PD7 PD6 PD5 PD4 PD3 PD2 PD1 PD0
DR
DR
DR
DR
DR
DR
DR
DR
Initial value: 0
0
0
0
0
0
0
0
R/W: R/W R/W R/W R/W R/W R/W R/W R/W
The port D data register (PDDR) is a 16-bit readable/writable register that stores port D data. Bits
PD13DR to PD0DR correspond to pins PD13/PULS6/HTxD0/HTxD1 to PD0/TIO1A.
When a pin functions as a general output, if a value is written to PDDR, that value is output
directly from the pin, and if PDDR is read, the register value is returned directly regardless of the
pin state.
When a pin functions as a general input, if PDDR is read the pin state, not the register value, is
returned directly. If a value is written to PDDR, although that value is written into PDDR it does
not affect the pin state. Table 21.8 summarizes port D data register read/write operations.
PDDR is initialized to H'0000 by a power-on reset (excluding a WDT power-on reset), and in
hardware standby mode. It is not initialized in software standby mode or sleep mode.
• Bits 15 and 14— Reserved: These bits always read 0. The write value should always be 0.
Table 21.8 Port D Data Register (PDDR) Read/Write Operations
Bits 13 to 0:
PDIOR
Pin Function
0
General input
Other than
general input
1
General output
Other than
general output
Read
Pin state
Pin state
PDDR value
PDDR value
Write
Value is written to PDDR, but does not affect pin
state
Value is written to PDDR, but does not affect pin
state
Write value is output from pin
Value is written to PDDR, but does not affect pin
state
Rev.2.0, 07/03, page 713 of 960