IPC@CHIP - SC12
Hardware Manual v1.1 [05.11.2002]
©BECK IPC GmbH page 11 of 28
Pin Name Type Function
TxD[0..1] O
Transmit Data (output)
These pins supply asynchronous serial transmit data to the system from
serial port 0 and 1.
RxD[0..1] I
Receive Data (input)
These pins supply asynchronous serial receive data from the system to
asynchronous serial ports 0 and 1.
CTS[0..1] I
Clear-to-Send (input)
These pins provide the Clear-to-Send signal for asynchronous serial port 0
and 1 when hardware flow control is enabled for the port. The CTS signals
gate the transmission of data from the associated serial port transmit
register. When CTS is asserted, the transmitter begins transmission of a
frame of data, if any is available. If CTS is deasserted, the transmitter holds
the data in the serial port transmit register. The value of CTS is checked
only at the beginning of the transmission of the frame.
RTS[0..1] O
Request-to-Send 0 (output)
These pins provide the Request-to-Send signal for asynchronous serial
ports 0 and 1 when hardware flow control is enabled for the port. The RTS
signals are asserted when the associated serial port transmit register
contains data that has not been transmitted.
4.8 DMA
Pin Name Type Function
DRQ[0..1] I
DMA Request (input, level-sensitive)
These pins indicate to the microcontroller that an external device is ready
for DMA channel 0 or 1 to perform a transfer. DRQ0 is edge-triggered and
internally synchronized. DRQ is not latched and must remain active until
serviced.
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