Datasheet

Section 10 I/O Ports
Page 678 of 1384 R01UH0310EJ0500 Rev. 5.00
Sep 25, 2012
H8S/2426, H8S/2426R, H8S/2424 Group
10.15.5 Pin Functions
Port G pins also function as the pins for bus control signal I/Os. The correspondence between the
register specification and the pin functions is shown below.
• PG6/BREQ-A
The pin function is switched as shown below according to the combination of the operating
mode, bit EXPE, bit BRLE in BCR of the bus controller, bit BREQS in PFCR4, and bit
PG6DDR.
Operating
mode
1, 2, 4 3, 7
EXPE ⎯ 0 1
BRLE
BREQS
BRLE = 0 or
BRLE = 1 and
BREQS = 1
BRLE = 1
and
BREQS = 0
⎯ BRLE = 0 or
BRLE = 1 and
BREQS = 1
BRLE = 1
and
BREQS = 0
PG6DDR 0 1 ⎯ 0 1 0 1 ⎯
Pin
function
PG6
input
PG6
output
BREQ-A
input
PG6
input
PG6
output
PG6
input
PG6
output
BREQ-A
input
• PG5/BACK-A
The pin function is switched as shown below according to the combination of the operating
mode, bit EXPE, bit BRLE in BCR of the bus controller, bit BACKS in PFCR4, and bit
PG5DDR.
Operating
mode
1, 2, 4 3, 7
EXPE ⎯ 0 1
BRLE
BACKS
BRLE = 0 or
BRLE = 1 and
BACKS = 1
BRLE = 1
and
BACKS = 0
⎯ BRLE = 0 or
BRLE = 1 and
BACKS = 1
BRLE = 1
and
BACKS = 0
PG5DDR 0 1 ⎯ 0 1 0 1 ⎯
Pin
function
PG5
input
PG5
output
BACK-A
output
PG5
input
PG5
output
PG5
input
PG5
output
BACK-A
output