HD6412350 Hitachi, HD6412350 Datasheet - Page 341

• Manufacturer Part Number: HD6412350
• Description: (HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
• Manufacturer: Hitachi

Port 1 Register (PORT1)
PORT1 is an 8-bit read-only register that shows the pin states. It cannot be written to. Writing of
output data for the port 1 pins (P1
If a port 1 read is performed while P1DDR bits are set to 1, the P1DR values are read. If a port 1
read is performed while P1DDR bits are cleared to 0, the pin states are read.
After a power-on reset and in hardware standby mode, PORT1 contents are determined by the pin
states, as P1DDR and P1DR are initialized. PORT1 retains its prior state after a manual reset, and
in software standby mode.
Bit
Initial value
R/W
Note: * Determined by state of pins P1
:
:
:
P17
—*
R
7
P16
—*
R
6
7
to P1
7
P15
0
—*
) must always be performed on P1DR.
R
to P1
5
0
.
P14
—*
R
4
P13
—*
R
3
P12
—*
R
2
P11
—*
R
1
P10
—*
R
0
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