Hitachi H8S/2215 Series, Hardware Manual

Page: 279 / 745

Rev. 3.0, 10/02, page 221 of 686
9.1 Port 1
Port 1 is an 8-bit I/O port. The port 1 has the following registers.
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Port 1 data direction register (P1DDR)
•
Port 1 data register (P1DR)
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Port 1 register (PORT1)
9.1.1 Port 1 Data Direction Register (P1DDR)
P1DR is an 8-bit write-only register, the individual bits of which specify input or output for the
pins of port 1.
Bit Bit Name Initial Value R/W Description
7 P17DDR 0 W
6 P16DDR 0 W
5 P15DDR 0 W
4 P14DDR 0 W
3 P13DDR 0 W
2 P12DDR 0 W
1 P11DDR 0 W
0 P10DDR 0 W
Modes 4 to 6:
If address output is enabled by the setting of bits AE3 to
AE0 in PFCR, pins P13 to P10 are address outputs. Pins
P17 to P14, and pins P13 to P10 when address output is
disabled, are output ports when the corresponding
P1DDR bits are set to 1, and input ports when the
corresponding P1DDR bits are cleared to 0.
Mode 7:
Setting a P1DDR bit to 1 makes the corresponding port 1
pin an output port, while clearing the bit to 0 makes the
pin an input port.
9.1.2 Port 1 Data Register (P1DR)
P1DR stores output data for the port 1 pins.
Bit Bit Name Initial Value R/W Description
7 P17DR 0 R/W
6 P16DR 0 R/W
5 P15DR 0 R/W
4 P14DR 0 R/W
3 P13DR 0 R/W
2 P12DR 0 R/W
1 P11DR 0 R/W
0 P10DR 0 R/W
An output data for a pin is stored when the pin function is
specified to a general purpose output port.