Datasheet

Section 9 I/O Ports

Rev. 2.00 Sep. 23, 2005 Page 109 of 472

REJ09B0160-0200

Section 9 I/O Ports

The group of 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 10 mA (@V

= 1.0 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, an RTC output pin, a 14-

bit PWM output pin, 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/PWM

P10/TMOW

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)