Rev. 1.0, 09/01, page 458 of 904
10.9.7
Pin Functions
Port A pins also function as the pins for address outputs and interrupt inputs. The correspondence
between the register specification and the pin functions is shown below.
PA7/A23/
,54
:
,54
:
,54
:
,54
:
, PA6/A22/
,54
9
,54
9
,54
9
,54
9
, PA5/A21/
,54
8
,54
8
,54
8
,54
8
The pin function is switched as shown below according to the operating mode, bit EXPE, bits
A23E to A21E, bits ITS7 to ITS5 in ITSR, and bit PADDR.
Operating
mode
1, 2, 4, 5, 6
7
EXPE
—
0
1
AxxE
0
1
—
0
1
PADDR
0
1
0
1
0
1
0
1
0
1
PA
input
PA
output
PA
input
Address
output
PA
input
PA
output
PA
input
PA
output
PA
input
Address
output
Pin
function
,54Q
interrupt input
*
xx = 23 to 21, n = 7 to 5
Note:
*
,54Q
input when ITSn = 0.
PA4/A20
The pin function is switched as shown below according to the operating mode, bit EXPE, bit
A20E and bit PA4DDR.
Operating
mode
1, 2, 5,
6
4
7
EXPE
—
—
0
1
A20E
—
0
1
—
0
1
PA4DDR
—
0
1
0
1
0
1
0
1
0
1
A20
output
PA4
input
PA4
output
PA4
input
A20
output
PA4
input
PA4
output
PA4
input
PA4
output
PA4
input
A20
output
Pin
function
,54
7
interrupt input
*
Note:
*
,54
7
input when ITS4 = 0.
Содержание H8S/2376 F-ZTAT
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