NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 503 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
SC Transfer Status Register (SC_STATUS)
Register
Offset
R/W
Description
Reset Value
SC_STATUS
x=0,1
0x020
R/W
SC Status Register
0x0000_0202
31
30
29
28
27
26
25
24
TXACT
TXOVERR
TXRERR
Reserved
TXPOINT
23
22
21
20
19
18
17
16
RXACT
RXOVERR
RXRERR
Reserved
RXPOINT
15
14
13
12
11
10
9
8
Reserved
CDPINSTS
CINSERT
CREMOVE
TXFULL
TXEMPTY
TXOV
7
6
5
4
3
2
1
0
Reserved
BEF
FEF
PEF
Reserved
RXFULL
RXEMPTY
RXOV
Bits
Description
[31]
TXACT
Transmit in Active Status Flag (Read Only)
0 = This bit is cleared automatically when TX transfer is finished or the last byte
transmission has completed.
1 = This bit is set by hardware when TX transfer is in active and the STOP bit of the last
byte has been transmitted.
[30]
TXOVERR
Transmitter over Retry Error (Read Only)
This bit is set by hardware when transmitter re-transmits over retry number limitation.
Note:
This bit is read only, but it can be cleared by writing 1 to it.
[29]
TXRERR
Transmitter Retry Error (Read Only)
This bit is set by hardware when transmitter re-transmits.
Note1:
This bit is read only, but it can be cleared by writing 1 to it.
Note2:
This bit is a flag and cannot generate any interrupt to CPU.
[28:26]
Reserved
Reserved.
[25:24]
TXPOINT
Transmit Buffer Pointer Status Flag (Read Only)
This field indicates the TX buffer pointer status flag. When CPU writes data into SC_DAT,
TXPOINT increases one. When one byte of TX Buffer is transferred to transmitter shift
register, TXPOINT decreases one.
[23]
RXACT
Receiver in Active Status Flag (Read Only)
This bit is set by hardware when RX transfer is in active.
This bit is cleared automatically when RX transfer is finished.
[22]
RXOVERR
Receiver over Retry Error (Read Only)
This bit is set by hardware when RX transfer error retry over retry number limit.
Note1:
This bit is read only, but it can be cleared by writing 1 to it.
Note2:
If CPU enables receiver retries function by setting RXRTY (SC_CTL[19]), the PEF
(SC_STATUS[4]) flag will be ignored (hardware will not set PEF (SC_STATUS[4])).