Fujitsu MB90460 Series, Hardware Manual, Page: 185 / 739

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CHAPTER 9 I/O PORT
9.2 Registers of I/O Port
This section provides a list of the registers related to the I/O port settings.
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Registers for I/O Ports
Table 9.2-1 is a list of the registers corresponding to individual port.
Note:
For port (other than Port 0,1,2 and 3) that is multiplexed with resource, use Read-modify-write
instruction (such as an instruction that sets bits) may accidentally write unexpected value to the DDR
and PDR register when resource is enabled.
Table 9.2-1 Registers and Corresponding port
Register Read/Write Address Initial value
Port 0 data register (PDR0) R/W 000000
H
XXXXXXXX
B
Port 1 data register (PDR1) R/W 000001
H
XXXXXXXX
B
Port 2 data register (PDR2) R/W 000002
H
XXXXXXXX
B
Port 3 data register (PDR3) R/W 000003
H
XXXXXXXX
B
Port 4 data register (PDR4) R/W 000004
H
-XXXXXXX
B
Port 5 data register (PDR5) R/W 000005
H
XXXXXXXX
B
Port 6 data register (PDR6) R/W 000006
H
----XXXX
B
Port 0 data direction register (DDR0) R/W 000010
H
00000000
B
Port 1 data direction register (DDR1) R/W 000011
H
00000000
B
Port 2 data direction register (DDR2) R/W 000012
H
00000000
B
Port 3 data direction register (DDR3) R/W 000013
H
00000000
B
Port 4 data direction register (DDR4) R/W 000014
H
–0000000
B
Port 5 data direction register (DDR5) R/W 000015
H
00000000
B
Port 6 data direction register (DDR6) R/W 000016
H
----0000
B
Analog data input enable register (ADER) R/W 000017
H
11111111
B
Port 0 pull-up resistor setting register (RDR0) R/W 00001C
H
00000000
B
Port 1 pull-up resistor setting register (RDR1) R/W 00001D
H
00000000
B
R/W: Read/write enabled
R: Read-only
X: Undefined
–: Not used