I/O Ports - Hitachi HD6473867 Hardware Manual

8.1 Overview
The H8/3864 Series is provided with six 8-bit I/O ports, one 4-bit I/O port, one 3-bit I/O port, one 8-
bit input-only port, and one 1-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 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 8-bit units.
Block diagrams of each port are given in Appendix C, I/O Port Block Diagrams.
Table 8-1 Port Functions
Port Description
Port 1 • 8-bit I/O port
• MOS input pull-up
option
Port 3 • 8-bit I/O port
• MOS input pull-up
option
• Large-current port
Port 4 • 1-bit input port
• 3-bit I/O port
Section 8 I/O Ports
Pins
P1 to P1 /
7 5
IRQ to IRQ
/
3 1
TMIF, TMIC
P1 /IRQ /ADTRG
4 4
P1 /TMIG
3
P1 , P1 /
2 1
TMOFH, TMOFL
P1 /TMOW
0
P3 /AEVL
7
P3 /AEVH
6
P3 /TXD
5 31
P3 /RXD
4 31
P3 /SCK
3 31
P3 /RESO
2
P3 /UD
1
P3 /PWM
0
P4 /IRQ
3 0
P4 /TXD
2 32
P4 /RXD
1 32
P4 /SCK
0 32
131
Other Functions
External interrupts 3 to 1
Timer event interrupts
TMIF, TMIC
External interrupt 4 and A/D
converter external trigger
Timer G input capture input
Timer F output compare
output
Timer A clock output
SCI3-1 data output (TXD
data input (RXD ), clock
31
input/output (SCK ),
31
and asynchronous counter
event inputs AEVL, AEVH
Reset output, timer C count-
up/down select input, and
14-bit PWM output
External interrupt 0
SCI3-2 data output (TXD
data input (RXD ), clock
32
input/output (SCK )
32
Function
Switching
Registers
PMR1
TCRF,
TMC
PMR1, AMR
PMR1
PMR1
PMR1
), PMR3
31
SCR31
SMR31
PMR3
PMR3
), SCR32
32
SMR32