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Section 8 I/O Ports
Table 8.1
Port Functions
Port
Description
Port 1
General I/O port
multiplexed with
address output and
address-data
multiplex I/O
Port 2
General I/O port
multiplexed with SCIF
control I/O
General I/O port
multiplexed with
address output and
address-data
multiplex I/O
Port 3
General I/O port
multiplexed with de-
bounced input and
bidirectional data bus
I/O
Port 4
General I/O port
multiplexed with
interrupt input, de-
bounced input,
address output, and
address-data
multiplex I/O
General I/O port
multiplexed with
interrupt input and
bidirectional data
bus* I/O
Rev. 1.00 Mar. 12, 2008 Page 188 of 1178
REJ09B0403-0100
Single-Chip Mode
(EXPE = 0)
P17
P16
P15
P14
P13
P12
P11
P10
P27/DTR
P26/DSR
P25/RI
P24/DCD
P23
P22
P21
P20
P37/ExDB7
P36/ExDB6
P35/ExDB5
P34/ExDB4
P33/ExDB3
P32/ExDB2
P31/ExDB1
P30/ExDB0
P47/IRQ7/RS7/DB7/HC7
P46/IRQ6/RS6/DB6/HC6
P45/IRQ5/RS5/DB5/HC5
P44/IRQ4/RS4/DB4/HC4
P43/IRQ3/RS3/HC3
P42/IRQ2/RS2/HC2
P41/IRQ1/RS1/HC1
P40/IRQ0/RS0/HC0
Extended Mode
(EXPE = 1)
P17/A7/AD7
P16/A6/AD6
P15/A5/AD5
P14/A4/AD4
P13/A3/AD3
P12/A2/AD2
P11/A1/AD1
P10/A0/AD0
Same as left
P23/A11/AD11
P22/A10/AD10
P21/A9/AD9
P20/A8/AD8
P37/ExDB7/D15
P36/ExDB6/D14
P35/ExDB5/D13
P34/ExDB4/D12
P33/ExDB3/D11
P32/ExDB2/D10
P31/ExDB1/D9
P30/ExDB0/D8
P47/A15/AD15
P46/A14/AD14
P45/A13/AD13
P44/A12/AD12
P43/IRQ3/RS3/HC3/D7*
P42/IRQ2/RS2/HC2/D6*
P41/IRQ1/RS1/HC1/D5*
P40/IRQ0/RS0/HC0/D4*
Feature of
I/O
Built-in input
pull-up MOS
Built-in input
pull-up MOS
Built-in input
pull-up MOS
Built-in input
pull-up MOS
LED driving
capability
(sink current
12 mA)
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