User Manual

AT75C220
83
USART Control Register
Name: US_CR
Access Type:Write-only
Reset Value:Undefined
• RSTRX: Reset Receiver
0 = No effect.
1 = The receiver logic is reset.
• RSTTX: Reset Transmitter
0 = No effect.
1 = The transmitter logic is reset.
• RXEN: Receiver Enable
0 = No effect.
1 = The receiver is enabled if RXDIS is 0.
• RXDIS: Receiver Disable
0 = No effect.
1 = The receiver is disabled.
• TXEN: Transmitter Enable
0 = No effect.
1 = The transmitter is enabled if TXDIS is 0.
• TXDIS: Transmitter Disable
0 = No effect.
1 = The transmitter is disabled.
• RSTSTA: Reset Status Bits
0 = No effect.
1 = Resets the status bits PARE, FRAME, OVRE and RXBRK in the US_CSR.
• STTBRK: Start Break
0 = No effect.
1 = If break is not being transmitted, starts transmission of a break after the characters present in US_THR and the
Transmit Shift Register have been transmitted.
• STPBRK: Stop Break
0 = No effect.
1 = If a break is being transmitted, stops transmission of the break after a minimum of one character length and trans-
mits a high level during 12 bit periods.
• STTTO: Start Time-out
0 = No effect.
1 = Starts waiting for a character before clocking the time-out counter.
• SENDA: Send Address
0 = No effect.
31 30 29 28 27 26 25 24
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23 22 21 20 19 18 17 16
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15 14 13 12 11 10 9 8
–––SENDA STTTO STPBRK STTBRK RSTSTA
76543210
TXDIS TXEN RXDIS RXEN RSTTX RSTRX ––