at75c220 ATMEL Corporation, at75c220 Datasheet - Page 132

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

SPI Status Register
Register Name: SP_SR
Access Type: Read-only
Reset Value: 0x0
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132
RDRF: Receive Data Register Full
TDRE: Transmit Data Register Empty
MODF: Mode Fault Error
OVRES: Overrun Error Status
SPENDTX: SPI End of Transmission
SPENDRX: SPI End of Reception
SPIENS: SPI Enable Status
0 = No data has been received since the last read of SP_RDR.
1 = Data has been received and the received data has been transferred from the serializer to SP_RDR since the last
read of SP_RDR.
0 = Data has been written to SP_TDR and not yet transferred to the serializer.
1 = The last data written in the Transmit Data Register has been transferred to the serializer.
TDRE equals zero when the SPI is disabled or at reset. The SPI enable command sets this bit to one.
0 = No mode fault has been detected since the last read of SP_SR.
1 = A mode fault occurred since the last read of the SP_SR.
0 = No overrun has been detected since the last read of SP_SR.
1 = An overrun has occurred since the last read of SP_SR.
An overrun occurs when SP_RDR is loaded at least twice from the serializer since the last read of the SP_RDR.
0 = No end of data transmission detected.
1 = End of data transmission detected.
0 = No end of data reception detected.
1 = End of data reception detected.
0 = SPI is disabled.
1 = SPI is enabled.
31
23
15
–
–
–
7
–
30
22
14
–
–
–
6
–
AT75C220
SPENDRX
29
21
13
–
–
–
5
SPENDTX
28
20
12
–
–
–
4
OVRES
27
19
11
–
–
–
3
MODF
26
18
10
–
–
–
2
TDRE
25
17
–
–
9
–
1
SPIENS
RDRF
24
16
–
8
–
0