236
5.8.3
Pin Functions
Port 7 pins also function as DMAC input/output pins (
DREQ0
,
TEND0
,
DACK0
,
DREQ1
,
TEND1
, and
DACK1
) and EXDMAC input/output pins (
EDREQ0
,
ETEND0
,
EDACK0
,
EDREQ1
,
ETEND1
, and
EDACK1
). Port 7 pin functions are shown in table 5.14.
Table 5.14
Port 7 Pin Functions
Pin
Selection Method and Pin Functions
P75/
DACK1
/
EDACK1
The pin function is switched as shown below according to the combination of bit
DMACS in PFCR2, bit SAE1 in DMABCRH, bit AMS in EDMDR1, and bit
P75DDR.
Modes 1, 2, 4, 5, 6, 7 (EXPE = 1)
AMS
0
1
SAE1
0
1
—
DMACS
—
0
1
—
P75DDR
0
1
0
1
—
—
Pin function
P75
input
pin
P75
output
pin
P75
input
pin
P75
output
pin
DACK1
output
pin
EDACK1
output
pin
Mode 7 (EXPE = 0)
AMS
—
SAE1
0
1
DMACS
—
0
1
P75DDR
0
1
0
1
—
Pin function
P75
input pin
P75
output pin
P75
input pin
P75
output pin
DACK1
output pin
Содержание H8S/2670
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