8. I/O Ports
Rev.3.00 Jul. 19, 2007 page 185 of 532
REJ09B0397-0300
Bits 7 and 6—Reserved Bits:
Bits 7 and 6 are reserved; they are always read as 1, and cannot be
modified.
Bits 5 and 4—Reserved Bits:
Bits 5 and 4 are reserved; they should always be cleared to 0.
Bit 3—P4
3
/
IRQ
0
Pin Function Switch (IRQ0):
This bit selects whether pin P4
3
/
IRQ
0
is used as
P4
3
or as
IRQ
0
.
Bit 3: IRQ0
Description
0
Functions as P4
3
input pin
(initial value)
1 Functions
as
IRQ
0
input pin
Note: Rising or falling edge sensing can be selected for the
IRQ
0
pin.
Bit 2—P3
2
/SO
1
Pin PMOS Control (POF1):
This bit controls the on/off state of the PMOS
transistor in the P3
2
/SO
1
pin output buffer.
Bit 2: POF1
Description
0
CMOS output
(initial value)
1
NMOS open-drain output
In the H8/3854 Group, bit 2 is reserved, and must always be cleared to 0.
Bit 1—P2
1
/UD Pin Function Switch (UD):
This bit selects whether pin P2
1
/UD is used as P2
1
or
as UD.
Bit 1: UD
Description
0
Functions as P2
1
I/O pin
(initial value)
1
Functions as UD input pin
In the H8/3854 Group, bit 1 is reserved, and must always be cleared to 0.
Bit 0: P2
0
/
IRQ
4
/
ADTRG
Pin Function Switch (IRQ4):
This bit selects whether pin
P2
0
/
IRQ
4
/
ADTRG
is used as P2
0
or as
IRQ
4
/
ADTRG
.
Bit 0: IRQ4
Description
0
Functions as P2
0
I/O pin
(initial value)
1 Functions
as
IRQ
4
/
ADTRG
input pin
Note: Rising or falling edge sensing can be selected for the
IRQ
4
pin.
See section 12.3.2, Start of A/D Conversion by External Trigger Input, for the
ADTRG
pin
setting.
Summary of Contents for F-ZTAT H8 Series
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Page 194: ...7 RAM Rev 3 00 Jul 19 2007 page 168 of 532 REJ09B0397 0300...
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