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Table 8.1 summarizes the port functions. The pins of each port also have other functions such as
input/output pins of on-chip peripheral modules or external interrupt input pins. Each I/O port
includes a data direction register (DDR) that controls input/output, a data register (DR) that stores
output data, a port register (PORT) used to read the pin states, and an input buffer control register
(ICR) that controls input buffer on/off. Port 5 does not have a DR or a DDR register.
Ports D to F, H, and I have internal input pull-up MOSs and a pull-up MOS control register (PCR)
that controls the on/off state of the input pull-up MOSs.
Ports 2 and F include an open-drain control register (ODR) that controls on/off of the output
buffer PMOSs.
All of the I/O ports can drive a single TTL load and capacitive loads up to 30 pF.
All of the I/O ports can drive Darlington transistors when functioning as output ports.
Ports 2 and 3 are Schmitt-trigger inputs. Schmitt-trigger inputs for other ports are enabled when
used as the IRQ, TPU, or TMR inputs.
Table 8.1
Port Functions
Port
Description
Port 1
General I/O port
also functioning
as interrupt inputs,
SCI I/Os, A/D
converter inputs,
and TPU inputs
Section 8 I/O Ports
Function
Bit
I/O
Input
IRQ7-A/
7
P17
TCLKD-B
IRQ6-A/
6
P16
TCLKC-B
IRQ5-A/
5
P15
TCLKB-B
IRQ4-A/
4
P14
TCLKA-B
ADTRG0/
3
P13
IRQ3-A
IRQ2-A
2
P12/SCK2
1
P11
RxD2/
IRQ1-A
IRQ0-A
0
P10
Schmitt-
Trigger
1
Output
Input*
IRQ7-A,
TCLKD-B
IRQ6-A,
TCLKC-B
IRQ5-A,
TCLKB-B
IRQ4-A,
TCLKA-B
IRQ3-A
IRQ2-A
IRQ1-A
IRQ0-A
TxD2
Rev.2.00 Jun. 28, 2007 Page 251 of 666
Section 8 I/O Ports
Input
Open-
Pull-up
Drain
MOS
Output
Function
Function
REJ09B0311-0200
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