Pin Functions - Hitachi H8S/2378, H8S/2378R Series Hardware Manual

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.
,54:, PA6/A22/,549 ,54: ,54:
PA7/A23/,54:
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 1, 2, 4, 5, 6
mode
EXPE
AxxE 0
PADDR 0 1
Pin PA PA
function input output
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 1, 2, 5,
mode 6
EXPE —
A20E —
PA4DDR — 0
Pin A20 PA4
function output input
Note: * ,547 input when ITS4 = 0.
Rev. 1.0, 09/01, page 458 of 904
,549, PA5/A21/,548 ,549 ,549
—
1
0 1 0
PA Address PA
input output input
,54Q interrupt input*
4
—
0 1
1 0 1
PA4 PA4 A20
output input output
,547 interrupt input*
,548 ,548 ,548
7
0
— 0
1 0
PA PA
output input output
0
— 0
0 1 0
PA4 PA4 PA4
input output input
1
1
1 0 1
PA PA Address
input output
7
1
1
1 0 1
PA4 PA4 A20
output input output