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18.1.4
Register Configuration
The 20-bit general-purpose I/O port, SCI I/O port, and SCIF I/O port have seven registers, as
shown in table 18.4.
Table 18.4 I/O Port Registers
Name
Port control register A
Port data register A
Port control register B
Port data register B
GPIO interrupt control
register
Serial port register
Serial port register
Note: * Initialized by a power-on reset.
Abbreviation R/W
PCTRA
R/W
PDTRA
R/W
PCTRB
R/W
PDTRB
R/W
GPIOIC
R/W
SCSPTR1
R/W
SCSPTR2
R/W
Initial Value* P4 Address
H'00000000
H'FF80002C H'1F80002C 32
Undefined
H'FF800030
H'00000000
H'FF800040
Undefined
H'FF800044
H'00000000
H'FF800048
Undefined
H'FFE0001C H'1FE0001C 8
Undefined
H'FFE80020 H'1FE80020 16
Rev. 4.0, 04/00, page 649 of 850
Area 7
Access
Address
Size
H'1F800030 16
H'1F800040 32
H'1F800044 16
H'1F800048 16
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