HD64F3670 Datasheet, PDF (115/323 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

Section 9 I/O Ports
The series of this LSI has twenty-six general I/O ports and four general input-only ports. Port 8 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 and a timer V input pin.
Figure 9.1 shows its pin configuration.
Port 1
P17/
P16
P15
P14/
P12
P11
P10
/TRGV
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)
Rev. 2.0, 03/02, page 91 of 298