RL78/G1H CHAPTER 14 SERIAL ARRAY UNIT
R01UH0575EJ0120 Rev. 1.20 Page 341 of 920
Dec 22, 2016
14.3.7 Serial status register mn (SSRmn)
The SSRmn register is a register that indicates the communication status and error occurrence status of channel
n. The errors indicated by this register are a framing error, parity error, and overrun error.
The SSRmn register can be read by a 16-bit memory manipulation instruction.
The lower 8 bits of the SSRmn register can be set with an 8-bit memory manipulation instruction with SSRmnL.
Reset signal generation clears the SSRmn register to 0000H.
Figure 14 - 12 Format of Serial status register mn (SSRmn) (1/2)
Note The SSR03 and SSR13 registers only.
Address: F0104H, F0105H (SSR02), F0106H, F0107H (SSR03), After reset: 0000H R
F0140H, F0141H (SSR10) to F0146H, F0147H (SSR13)
Symbol1514131211109876543210
SSRmn000000000
TSF
mn
BFF
mn
00
FEF
mn
Note
PEF
mn
OVF
mn
TSF
mn
Communication status indication flag of channel n
0 Communication is stopped or suspended.
1 Communication is in progress.
<Clear conditions>
• The STmn bit of the STm register is set to 1 (communication is stopped) or the SSmn bit of the SSm register is set to
1 (communication is suspended).
• Communication ends.
<Set condition>
• Communication starts.
BFF
mn
Buffer register status indication flag of channel n
0 Valid data is not stored in the SDRmn register.
1 Valid data is stored in the SDRmn register.
<Clear conditions>
• Transferring transmit data from the SDRmn register to the shift register ends during transmission.
• Reading receive data from the SDRmn register ends during reception.
• The STmn bit of the STm register is set to 1 (communication is stopped) or the SSmn bit of the SSm register is set to
1 (communication is enabled).
<Set conditions>
• Transmit data is written to the SDRmn register while the TXEmn bit of the SCRmn register is set to 1 (transmission or
transmission and reception mode in each communication mode).
• Receive data is stored in the SDRmn register while the RXEmn bit of the SCRmn register is set to 1 (reception or
transmission and reception mode in each communication mode).
• A reception error occurs.
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