FEDL675001-01
OKI Semiconductor
ML675001/67Q5002/67Q5003
12/24
Pin Name
I/O
Description
Primary
/
Secondary
Logic
DMA control signals
DREQ[0]
I
Ch 0 DMA request signal, used when DMA controller configured for
DREQ type
Secondary
Positive
DREQCLR[0]
O
Ch 0 DREQ signal clear request. The DMA device responds to this
output by negating DREQ.
Secondary
Positive
TCOUT[0]
O
Indicates to Ch 0 DMA device that last transfer has started.
Secondary
Positive
DREQ[1]
I
Ch 1 DMA request signal, used when DMA controller configured for
DREQ type
Secondary
Positive
DREQCLR[1]
O
Ch 1 DREQ signal clear request. The DMA device responds to this
output by negating DREQ.
Secondary
Positive
TCOUT[1]
O
Indicates to Ch 1 DMA device that last transfer has started
Secondary
Positive
UART
SIN
I
SIO receive signal
Secondary
Positive
SOUT
O
SIO transmit signal
Secondary
Positive
CTS
I
Clear To Send.
Indicates that modem or data set is ready to transfer data.
Bit 4 in
modem status register reflects this input.
Secondary
Negative
DSR
I
Data Set Ready.
Indicates that modem or data set is ready to establish a
communications link with UART.
Bit 5 in modem status register reflects this input.
Secondary
Negative
DCD
I
Data Carrier Detect.
Indicates that modem or data set has detected data carrier signal. Bit
7 in modem status register reflects this input.
Data Carrier Detect
Secondary
Negative
DTR
O
Data Terminal Ready.
Indicates that UART is ready to establish a communications link with
modem or data set. Bit 0 in modem control register controls this
output.
Secondary
Negative
RTS
O
Request To Send.
Indicates that UART is ready to transfer data to modem or data set. Bit
1 in modem control register controls this output.
Secondary
Negative
RI
I
Ring Indicator. Indicates that modem or data set has received
telephone ring indicator. Bit 6 in modem status register reflects this
input.
Secondary
Negative
SIO
STXD
O
SIO transmit signal
Secondary
Positive
SRXD
I
SIO receive signal
Secondary
Positive