HD6473228P10V Datasheet, PDF (88/301 Pages) Renesas Technology Corp – Regarding the change of names mentioned in the document, such as Hitachi Electric and Hitachi XX, to Renesas Technology Corp

Table 5-3 details the port 1 registers.
Table 5-3. Port 1 Registers
Name
Abbreviation
Port 1 data direction register P1DDR
Port 1 data register
P1DR
Read/Write
W
R/W
Initial value
H’FF (mode 1)
H’00 (modes 2 and 3)
H’00
Address
H’FFB0
H’FFB2
Port 1 Data Direction Register (P1DDR)—H’FFB0
Bit
7
6
5
4
3
2
1
0
P17DDR P16DDR P15DDR P14DDR P13DDR P12DDR P11DDR P10DDR
Mode 1
Initial value
1
1
1
1
1
1
1
1
Read/Write
—
—
—
—
—
—
—
—
Modes 2 and 3
Initial value
0
0
0
0
0
0
0
0
Read/Write
W
W
W
W
W
W
W
W
P1DDR is an 8-bit register that selects the direction of each pin in port 1. A pin functions as an
output pin if the corresponding bit in P1DDR is set to 1, and as an input pin if the bit is cleared to 0.
Port 1 Data Register (P1DR)—H’FFB2
Bit
Initial value
Read/Write
7
6
5
4
3
2
1
0
P17
P16
P15
P14
P13
P12
P11
P10
0
0
0
0
0
0
0
0
R/W R/W R/W R/W R/W R/W R/W R/W
P1DR is an 8-bit register containing output data for pins P17 to P10, and controlling their input pull-
ups.
MOS Pull-Ups: Are available for input pins in modes 2 and 3. Software can turn on the MOS pull-
up by writing a 1 in P1DR, and turn it off by writing a 0. The pull-ups are automatically turned off
for output pins in modes 2 and 3, and for all pins in mode 1.
Mode 1: In mode 1 (expanded mode without on-chip ROM), port 1 is automatically used for
address output. The port 1 data direction register is unwritable. All bits in P1DDR are automatically
set to 1 and cannot be cleared to 0.
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