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RL78/G1A CHAPTER 12 SERIAL ARRAY UNIT
R01UH0305EJ0200 Rev.2.00 420
Jul 04, 2013
Figure 12-10. Format of Serial Status Register mn (SSRmn) (2/2)
Address: F0100H, F0101H (SSR00) to F0106H, F0107H (SSR03), After reset: 0000H R
F0140H, F0141H (SSR10), F0142H, F0143H (SSR11)
Note 1
Symbol 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SSRmn 0 0 0 0 0 0 0 0 0
TSF
mn
BFF
mn
0 0
FEFm
n
Note 2
PEF
mn
OVF
mn
FEFm
n
Note 2
Framing error detection flag of channel n
0
No error occurs.
1 An error occurs (during UART reception).
<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.
PEF
mn
Parity/ACK error detection flag of channel n
0 No error occurs.
1 Parity error occurs (during UART reception) or ACK is not detected (during I
2
C transmission).
<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
2
C transmission (ACK is
not detected).
OVF
mn
Overrun error detection flag of channel n
0 No error occurs.
1 An error occurs
<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.
Notes 1. SSR00 to SSR03: All products
SSR10, SSR11: 32, 48, and 64-pin products
2. The SSR01, SSR03, and SSR11 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)
<R>