Rev. 5.00, 12/03, page 291 of 1088
Bit 1—Address 21 Enable (A21E): Enables or disables address output 21 (A21). For details, see
section 8.2, Port 1.
Bit 0—Address 20 Enable (A20E): Enables or disables address output 20 (A20). For details, see
section 8.2, Port 1.
Port Function Control Register 2 (PFCR2)
Bit
:
7
6
5
4
3
2
1
0
—
—
CS167E
CS25E
ASOD
—
—
—
Initial value :
0
0
1
1
0
0
0
0
R/W
:
R/W
R/W
R/W
R/W
R/W
R
R
R
PFCR2 is an 8-bit readable/writable register that performs I/O port control. PFCR2 is initialized to
H'30 by a reset, and in hardware standby mode. This bit is valid in modes 4 to 6.
Bits 7 and 6—Reserved: Only 0 should be written to these bits.
Bit 5—CS167 Enable (CS167E): Enables or disables
CS1
,
CS6
, and
CS7
output. Change the
CS167E setting only when the DDR bits are cleared to 0.
Bit 5
CS167E
Description
0
CS1
,
CS6
, and
CS7
output disabled (can be used as I/O ports)
1
CS1
,
CS6
, and
CS7
output enabled
(Initial value)
Bit 4—CS25 Enable (CS25E): Enables or disables
CS2
,
CS3
,
CS4
, and
CS5
output. Change the
CS25E setting only when the DDR bits are cleared to 0. This bit is valid in modes 4 to 6.
Bit 4
CS25E
Description
0
CS2
,
CS3
,
CS4
, and
CS5
output disabled (can be used as I/O ports)
1
CS2
,
CS3
,
CS4
, and
CS5
output enabled
(Initial value)
Bit 3—AS Output Disable (ASOD): Enables or disables
AS
output. This bit is valid in modes 4
to 6. For details, see section 8.11, Port F.
Bits 2 to 0—Reserved: When read, these bits are always read as 0.
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