Register Descriptions - Hitachi H8/3032 Series Hardware Manual

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7.3.2 Register Descriptions

Table 7-3 summarizes the registers of port 2.
Table 7-3 Port 2 Registers
Address* Name
H'FFC1 Port 2 data direction register
H'FFC3 Port 2 data register
H'FFD8 Port 2 input pull-up control register
Note: * Lower 16 bits of the address.
Port 2 Data Direction Register (P2DDR): P2DDR is an 8-bit write-only register that can select
input or output for each pin in port 2.
Bit 7
P2 DDR P2 DDR
7 6
0
Initial value
W
Read/Write
Mode 1: A pin in port 2 becomes an address output pin if the corresponding P2DDR bit is set to 1,
and a generic input pin if this bit is cleared to 0.
Modes 2 and 3: Port 2 functions as an input/output port. A pin in port 2 becomes an output pin if
the corresponding P2DDR bit is set to 1, and an input pin if this bit is cleared to 0.
P2DDR is a write-only register. Its value cannot be read. All bits return 1 when read.
P2DDR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode it
retains its previous setting. If a P2DDR bit is set to 1, the corresponding pin maintains its output
state in software standby mode.
Abbreviation
P2DDR
P2DR
P2PCR
6 5 4 3
P2 DDR P2 DDR P2 DDR
5 4 3
0 0 0 0
W W W W
Port 2 data direction 7 to 0
These bits select input or
output for port 2 pins
127
R/W Initial Value
W H'00
R/W H'00
R/W H'00
2 1 0
P2 DDR P2 DDR P2 DDR
2 1 0
0 0 0
W W W