Hitachi H8S/2678 Series Reference Manual page 254

Pin Selection Method and Pin Functions
P74/DACK0/ The pin function is switched as shown below according to the combination of bit
EDACK0
DMACS in PFCR2, bit SAE0 in DMABCRH, bit AMS in EDMDR0, and bit
P74DDR.
Modes 1, 2, 4, 5, 6, 7 (EXPE = 1)
AMS
SAE0
DMACS
P74DDR
Pin function
Mode 7 (EXPE = 0)
AMS
SAE0
DMACS
P74DDR
Pin function
0
—
0 1
P74 P74
input output
pin pin
0
—
0 1
P74 P74
input pin output pin
0
1
0
0 1
P74 P74
input output
pin pin
—
1
0
0 1
P74 P74
input pin output pin
1
—
1 —
— —
DACK0 EDACK0
output output
pin pin
1
—
DACK0
output pin
237