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Table 8.1 (b)
H8/3854 Group Port Functions
Port
Description
• 5-bit I/O port
Port 1
• Input pull-up MOS
option
• 8-bit I/O port
Port 2
• Open drain output
option
• High-current port
• 1-bit input-only port P4
Port 4
• 3-bit I/O port
• 8-bit I/O port
Port 5
• Input pull-up MOS
option
Port 9* • 8-bit I/O port
Port A* • 4-bit I/O port
• 4-bit input port
Port B
Note:
This I/O port is used to interface to the LCD controller.
*
Pins
Other Functions
P1
, P1
/
External interrupts 3, 1
7
5
IRQ
, IRQ
/
Timer event input TMIF, TMIB
3
1
TMIF, TMIB
P1
, P1
/
Timer F output compare
2
1
TMOFH, TMOFL
P1
/TMOW
Timer A clock output
0
P2
to P2
None
7
1
P2
/IRQ
/
External interrupt 4 and A/D
0
4
ADTRG
converter external trigger
/IRQ
External interrupt 0
3
0
P4
/TXD
SCI3 data output (TXD), data input
2
(RXD), clock input/output (SCK
P4
/RXD
1
P4
/SCK
0
3
P5
to P5
/
Wakeup input (WKP
7
0
WKP
to WKP
7
0
P9
to P9
None
7
0
PA
to PA
None
3
0
PB
to PB
/
A/D converter analog input
7
4
AN
to AN
7
4
to WKP
7
0
Rev.3.00 Jul. 19, 2007 page 171 of 532
8. I/O Ports
Function
Switching
Register
PMR1
TCRF,
TMB
PMR1
PMR1
PMR2
AMR
PMR2
SCR3
)
SMR
3
)
PMR5
AMR
REJ09B0397-0300
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