Section 8 I/O Ports; Overview - Renesas H8 Series Hardware Manual

8.1

Overview

The H8/3644 Group is provided with three 8-bit I/O ports, three 5-bit I/O ports, two 3-bit I/O
ports, and one 8-bit input-only port. Table 8.1 indicates the functions of each port.
Each port has of a port control register (PCR) that controls input and output, and a port data
register (PDR) for storing output data. Input or output can be assigned to individual bits.
See section 2.9.2, Notes on Bit Manipulation, for information on executing bit-manipulation
instructions to write data in PCR or PDR.
Block diagrams of each port are given in appendix C, I/O Port Block Diagrams.
Table 8.1 Port Functions
Port Description
•
Port 1
5-bit I/O port
•
Input pull-up
MOS selectable
Port 2 •
3-bit I/O port
•
Port 3
3-bit I/O port
•
Input pull-up
MOS selectable
•
Port 5
8-bit I/O port
•
Input pull-up
MOS

Section 8 I/O Ports

Pins Other Functions
P1 /IRQ /TRGV External interrupt 3, timer
7 3
V trigger input
P1 to P1 /
6 5
IRQ to IRQ
External interrupts 2 and 1
2 1
P1 /PWM 14-bit PWM output
4
P1 /TMOW Timer A clock output
0
P2 /TxD SCI3 data output
2
P2 /RxD SCI3 data input
1
P2 /SCK SCI3 clock input/output
0 1
P3 /SO SCI1 data output (SO
2 1
data input (SI
P3 /SI
1 1
input/output (SCK
P3 /SCK
0 1
P5 /INT INT interrupt 7
7 7
P5 /INT / INT interrupt 6
6 6
TMIB
Timer B1 event input
P5 /INT / INT interrupt 5
5 5
ADTRG
A/D converter external
trigger input
P5 to P5 / INT interrupts 4 to 0
4 0
INT to INT
4 0
Function Switching
Register
PMR1
PMR1
PMR1
PMR7
SCR3
SCR3, SMR
), PMR3
1
), clock
1
)
1
Rev. 6.00 Sep 12, 2006 page 169 of 526
Section 8 I/O Ports
REJ09B0326-0600