NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 505 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
Note2:
If CPU sets receiver retries function by setting RXRTYEN (SC_CTL[19]) ,
hardware will not set this flag.
[5]
FEF
Receiver Frame Error Status Flag (Read Only)
Thi
s bit is set to logic 1 whenever the received character does not have a valid “stop bit”
(that is, the stop bit following the last data bit or parity bit is detected as a logic 0).
Note1:
This bit is read only, but it can be cleared by writing 1 to it.
Note2:
If CPU sets receiver retries function by setting RXRTY_EN (SC_CTL[19]),
hardware will not set this flag.
[4]
PEF
Receiver Parity Error Status Flag (Read Only)
This bit is set to logic 1 whenever the received character does not have a valid
“parity bit”.
Note1:
This bit is read only, but it can be cleared by writing 1 to it.
Note2:
If CPU sets receiver retries function by setting RXRTY_EN (SC_CTL[19]),
hardware will not set this flag.
[3]
Reserved
Reserved.
[2]
RXFULL
Receiver Buffer Full Status Flag (Read Only)
This bit indicates RX buffer full or not.
This bit is set when RX pointer is equal to 4, otherwise it is cleared by hardware.
[1]
RXEMPTY
Receiver Buffer Empty Status Flag (Read Only)
This bit indicates RX buffer empty or not.
When the last byte of Rx buffer has been read by CPU, hardware sets this bit high. It will
be cleared when SC receives any new data.
[0]
RXOV
RX Overflow Error Status Flag (Read Only)
This bit is set when RX buffer overflow.
If the number of received bytes is greater than Rx Buffer size (4 bytes), this bit will be set.
Note:
This bit is read only, but it can be cleared by writing 1 to it.