hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 235

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

8.1
The LSI is provided with five 8-bit I/O ports, two 4-bit I/O ports, one 3-bit I/O port, one 8-bit
input-only port, one 1-bit input-only port, and one 6-bit output-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.
Ports 5, 6, 7, 8, and A are also used as liquid crystal display segment and common pins, selectable
in 4-bit units.
Block diagrams of each port are given in Appendix C, I/O Port Block Diagrams.
Table 8.1
Port
Port 1
Port 3
Description
•
•
•
•
•
•
Overview
4-bit I/O port
MOS input pull-up
option
8-bit I/O port
MOS input pull-up
option
Large-current
port *
MOS open drain
output selectable
(only P3
Port Functions
2
5
)
Section 8 I/O Ports
Pins
P1
P1
P1
P1
P3
P3
P3
P3
P3
P3
7
6
4
3
7
6
5
2
1
0
/
*
/
/TMIG
/AEVL
/AEVH
, TMOFH
, TMOFL
/UD
I R Q
I R Q
to P3
1
3
4
/TMIF
/
3
A D T R G
Other Functions
External interrupt 3, timer
event input pin TMIF
None
External interrupt 4, A/D
converter external trigger
Timer G input capture
Asynchronous counter event
input pins AEVL, AEVH
None
Timer F output compare
output
Timer C count up/down
selection input
Rev. 7.00 Mar 10, 2005 page 193 of 652
Section 8 I/O Ports
REJ09B0042-0700
Function
Switching
Registers
PMR1
TCRF
PMR1
AMR
PMR1
PMR2
PMR3
ECCR
PMR2
PMR3
PMR3