Renesas Stereo System SH7709S User Manual
Rev. 5.00, 09/03, page 592 of 760
19.4.2
Port C Data Register (PCDR)
Bit:
7
6
5
4
3
2
1
0
PC7DT
PC6DT
PC5DT
PC4DT
PC3DT
PC2DT
PC1DT
PC0DT
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 C data register (PCDR) is an 8-bit readable/writable register that stores data for pins
PTC7 to PTC0. Bits PC7DT to PC0DT correspond to pins PTC7 to PTC0. When the pin function
is general output port, if the port is read, the value of the corresponding PCDR bit is returned
directly. When the function is general input port, if the port is read, the corresponding pin level is
read. Table 19.6 shows the function of PCDR.
PTC7 to PTC0. Bits PC7DT to PC0DT correspond to pins PTC7 to PTC0. When the pin function
is general output port, if the port is read, the value of the corresponding PCDR bit is returned
directly. When the function is general input port, if the port is read, the corresponding pin level is
read. Table 19.6 shows the function of PCDR.
PCDR is initialized to H'00 by a power-on reset, after which the general input port function (pull-
up MOS on) is set as the initial pin function, and the corresponding pin levels are read.
up MOS on) is set as the initial pin function, and the corresponding pin levels are read.
PCDR retains its previous value in standby mode and sleep mode, and in a manual reset.
Table 19.6
Port C Data Register (PCDR) Read/Write Operations
PCnMD1
PCnMD0
Pin State
Read
Write
0
0
Other function
(see table 18.1)
(see table 18.1)
PCDR value
Value is written to PCDR, but does not
affect pin state
affect pin state
1
Output
PCDR value
Write value is output from pin
1
0
Input (Pull-up
MOS on)
MOS on)
Pin state
Value is written to PCDR, but does not
affect pin state
affect pin state
1
Input (Pull-up
MOS off)
MOS off)
Pin state
Value is written to PCDR, but does not
affect pin state
affect pin state
(n = 7 to 0)