1. Port data register 1 (PDR1)
Bit
7
6
5
P15
0
4
3
2
1
P11
0
0
P10
0
P17
0
P16
0
P14
0
P1 3
0
P12
0
Initial value
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PDR1 is an 8-bit register that stores data for port 1 pins P17 to P10. If port 1 is read while PCR1
bits are set to 1, the values stored in PDR1 are read, regardless of the actual pin states. If port 1 is
read while PCR1 bits are cleared to 0, the pin states are read.
Upon reset, PDR1 is initialized to H'00.
2. Port control register 1 (PCR1)
Bit
7
6
5
4
3
2
1
0
PCR1
PCR16 PCR1
PCR14 PCR1
3
PCR12 PCR11 PCR10
7
5
Initial value
Read/Write
0
0
0
0
0
0
0
0
W
W
W
W
W
W
W
W
PCR1 is an 8-bit register for controlling whether each of the port 1 pins P17 to P10 functions as an
input pin or output pin. Setting a PCR1 bit to 1 makes the corresponding pin an output pin, while
clearing the bit to 0 makes the pin an input pin. The settings in PCR1 and in PDR1 are valid only
when the corresponding pin is designated in PMR1 as a general I/O pin.
Upon reset, PCR1 is initialized to H'00.
PCR1 is a write-only register, which is always read as all 1s.
3. Port pull-up control register 1 (PUCR1)
Bit
7
6
5
4
3
2
1
0
PUCR17 PUCR16 PUCR15 PUCR14 PUCR13 PUCR12 PUCR11 PUCR10
Initial value
Read/Write
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PUCR1 controls whether the MOS pull-up of each of the port 1 pins P17 to P10 is on or off. When
a PCR1 bit is cleared to 0, setting the corresponding PUCR1 bit to 1 turns on the MOS pull-up for
the corresponding pin, while clearing the bit to 0 turns off the MOS pull-up.
Upon reset, PUCR1 is initialized to H'00.
133
ETC [ ETC ]
