Section 9 I/O Ports; Port 1; Figure 9.1 Port 1 Pin Configuration - Renesas H8 Series Hardware Manual

The group of this LSI has thirty-one general I/O ports and eight general input-only ports. Port 8 is
a large current port, which can drive 20 mA (@V
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 A output pin, and
a timer V input pin. Figure 9.1 shows its 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)

Section 9 I/O Ports

OL
Port 1

Figure 9.1 Port 1 Pin Configuration

= 1.5 V) when a low level signal is output.
P17/IRQ3/TRGV
P16/IRQ2
P15/IRQ1
P14/IRQ0
P12
P11
P10/TMOW
Rev. 1.00 Aug. 28, 2006 Page 117 of 400
Section 9 I/O Ports
REJ09B0268-0100