
MB90560 series
CHAPTER 8 I/O PORTS
175
8.2
Port Register
This section provides a list of the registers related to the I/O port settings and shows
how each port is assigned to the external pins.
I
Registers for I/O Ports
Table 8.2-1 is a list of the registers corresponding to individual ports.
Table 8.2-1 Registers and corresponding ports
R/W:Read/write enabled
R:Read only
X:Undefined
–:Not used
Register
Read/Write
Address
Initial value
Port 0 data register (PDR0)
R/W
000000H
XXXXXXXXB
Port 1 data register (PDR1)
R/W
000001H
XXXXXXXXB
Port 2 data register (PDR2)
R/W
000002H
XXXXXXXXB
Port 3 data register (PDR3)
R/W
000003H
XXXXXXXXB
Port 4 data register (PDR4)
R/W
000004H
–XXXXXXXB
Port 5 data register (PDR5)
R/W
000005H
XXXXXXXXB
Port 6 data register (PDR6)
R/W
000006H
----XXXXB
Port 0 data direction register (DDR0)
R/W
000010H
00000000B
Port 1 data direction register (DDR1)
R/W
000011H
00000000B
Port 2 data direction register (DDR2)
R/W
000012H
00000000B
Port 3 data direction register (DDR3)
R/W
000013H
00000000B
Port 4 data direction register (DDR4)
R/W
000014H
–0000000B
Port 5 data direction register (DDR5)
R/W
000015H
00000000B
Port 6 data direction register (DDR6)
R/W
000016H
----0000B
Analog data input enable register (ADER)
R/W
000017H
11111111B
Port 0 pull-up resistor setting register (RDR0)
R/W
00008CH
00000000B
Port 1 pull-up resistor setting register (RDR1)
R/W
00008DH
00000000B