Datasheet

Section 9 I/O Ports
Rev. 4.00 Mar. 15, 2006 Page 111 of 556
REJ09B0026-0400
Section 9 I/O Ports
This LSI has forty-five general I/O ports and eight general input-only ports. Port 6 is a large
current port, which can drive 20 mA (@V
OL
= 1.5 V) when a low level signal is output. Any of
these ports can become an input port immediately after a reset. They can also be used as I/O pins
of the on-chip peripheral modules or external interrupt input pins, and these functions can be
switched depending on the register settings. The registers for selecting these functions can be
divided into two types: those included in I/O ports and those included in each on-chip peripheral
module. General I/O ports are comprised of the port control register for controlling inputs/outputs
and the port data register for storing output data and can select inputs/outputs in bit units.
For functions in each port, see appendix B.1, I/O Port Block Diagrams. For the execution of bit-
manipulation instructions to the port control register and port data register, see section 2.8.3, Bit
Manipulation Instruction.
9.1 Port 1
Port 1 is a general I/O port also functioning as IRQ interrupt input pins, a timer B1 input pin, and a
timer V input pin. Figure 9.1 shows its pin configuration.
P17/IRQ3/TRGV
P16/IRQ2
P15/IRQ1/TMIB1
P14/IRQ0
P12
P11
P10
Port 1
Figure 9.1 Port 1 Pin Configuration
Port 1 has the following registers.
• Port mode register 1 (PMR1)
• Port control register 1 (PCR1)
• Port data register 1 (PDR1)
• Port pull-up control register 1 (PUCR1)