at75c220 ATMEL Corporation, at75c220 Datasheet - Page 83

• Manufacturer Part Number: at75c220
• Description: Smart Internet Appliance Processor Siap
• Manufacturer: ATMEL Corporation

USART Control Register
Name:
Access Type:Write-only
Reset Value:Undefined
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RSTRX: Reset Receiver
RSTTX: Reset Transmitter
RXEN: Receiver Enable
RXDIS: Receiver Disable
TXEN: Transmitter Enable
TXDIS: Transmitter Disable
RSTSTA: Reset Status Bits
STTBRK: Start Break
STPBRK: Stop Break
STTTO: Start Time-out
SENDA: Send Address
0 = No effect.
1 = The receiver logic is reset.
0 = No effect.
1 = The transmitter logic is reset.
0 = No effect.
1 = The receiver is enabled if RXDIS is 0.
0 = No effect.
1 = The receiver is disabled.
0 = No effect.
1 = The transmitter is enabled if TXDIS is 0.
0 = No effect.
1 = The transmitter is disabled.
0 = No effect.
1 = Resets the status bits PARE, FRAME, OVRE and RXBRK in the US_CSR.
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.
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.
0 = No effect.
1 = Starts waiting for a character before clocking the time-out counter.
0 = No effect.
TXDIS
31
23
15
–
–
–
7
US_CR
TXEN
30
22
14
–
–
–
6
RXDIS
29
21
13
–
–
–
5
SENDA
RXEN
28
20
12
–
–
4
RSTTX
STTTO
27
19
11
–
–
3
STPBRK
RSTRX
26
18
10
–
–
2
STTBRK
25
17
–
–
9
1
–
RSTSTA
24
16
–
–
8
0
–
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