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Serial port control and status registers
620
NS9750 Hardware Reference
D17 R DSR 0 Data set ready
0 Inactive
1 Active
Indicates the current state of the EIA data set ready signal.
D16 R CTS 0 Clear to send
0 Inactive
1 Active
Indicates the current state of the EIA clear-to-send signal.
D15 R RBRK 0 Receive break condition
Indicates that a receive break condition has been found.
The receive data buffer is closed under this condition.
In DMA mode, this field is copied to bit [3] in the DMA
buffer descriptor.
D14 R RFE 0 Receive framing error
Indicates that a receive framing error condition has been
found. The receive buffer is closed under this condition.
In DMA mode, this field is copied to bit [2] in the DMA
buffer descriptor.
D13 R RPE 0 Receive parity error
Indicates that a receive parity error has been found. The
receive data buffer is closed under this condition.
In DMA mode, this field is copied to bit [1] in the DMA
buffer descriptor.
Bits Access Mnemonic Reset Description
Table 369: Serial Channel B/A/C/D Status Register A