Renesas RL78 Series User Manual page 408

RL78/G1D
Address: F0100H, F0101H (SSR00) to F0106H, F0107H (SSR03),
F0140H, F0141H (SSR10), F0142H, F0143H (SSR11)
Symbol 15 14
SSRmn 0 0
Note
FEFmn
0
1
<Clear condition>
● 1 is written to the FECTmn bit of the SIRmn register.
<Set condition>
● A stop bit is not detected when UART reception ends.
PEFmn
0
1
<Clear condition>
● 1 is written to the PECTmn bit of the SIRmn register.
<Set condition>
● The parity of the transmit data and the parity bit do not match when UART reception ends (parity error).
● No ACK signal is returned from the slave channel at the ACK reception timing during I
not detected).
OVFmn
0
1
<Clear condition>
● 1 is written to the OVCTmn bit of the SIRmn register.
<Set condition>
● Even though receive data is stored in the SDRmn register, that data is not read and transmit data or the next
receive data is written while the RXEmn bit of the SCRmn register is set to 1 (reception or transmission and
reception mode in each communication mode).
● Transmit data is not ready for slave transmission or transmission and reception in CSI mode.
Note The SSR01 and SSR03 registers only.
Cautions 1. If data is written to the SDRmn register when BFFmn = 1, the transmit/receive data stored in
the register is discarded and an overrun error (OVEmn = 1) is detected.
2. When the CSI is performing reception operations in the SNOOZE mode (SWCm = 1), the
OVFmn flag will not change.
Remark m: Unit number (m = 0, 1), n: Channel number (n = 0 to 3 for m = 0, n = 0, 1 for m = 1)
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
Figure 13-11. Format of Serial Status Register mn (SSRmn) (2/2)
13 12 11 10
0 0 0 0
No error occurs.
An error occurs (during UART reception).
No error occurs.
Parity error occurs (during UART reception) or ACK is not detected (during I
No error occurs.
An error occurs
After reset: 0000H
9 8 7 6
0 0 0 TSF
mn
Framing error detection flag of channel n
Parity/ACK error detection flag of channel n
Overrun error detection flag of channel n
CHAPTER 13 SERIAL ARRAY UNIT
R
5 4 3 2
BFF 0 0 FEFm
Note
mn n
2
C transmission).
2
C transmission (ACK is
1 0
PEF OVF
mn mn
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