Renesas H8S Series Hardware Manual page 953

SSR1—Serial Status Register 1
Bit
Initial value
Read/Write
Transmit Data Register Empty
0
1
Note: * Can only be written with 0 for flag clearing.
: 7 6 5
TDRE RDRF ORER ERS
: 1 0 0
:
R/(W)* R/(W)* R/(W)* R/(W)*
Error Signal Status
0
[Clearing conditions]
• On reset, or in standby mode or module stop mode
• When 0 is written to ERS after reading ERS =1
[Setting condition]
1
When the error signal is sampled at the low level
Note: Clearing the TE bit in SCR to 0 does not affect the ERS flag, which retains its prior state.
Overrun Error
0 [Clearing condition]
When 0 is written to ORER after reading ORER = 1
1 [Setting condition]
When the next serial reception is completed while RDRF = 1
Receive Data Register Full
0 [Clearing conditions]
• When 0 is written to RDRF after reading RDRF = 1
• When the DMAC or DTC is activated by an RXI interrupt and read data from RDR
1 [Setting condition]
When serial reception ends normally and receive data is transferred from RSR to RDR
[Clearing conditions]
• When 0 is written to TDRE after reading TDRE = 1
• When the DMAC or DTC is activated by a TXI interrupt and write data to TDR
[Setting conditions]
• When the TE bit in SCR is 0
• When data is transferred from TDR to TSR and data can be written to TDR
H'FF84
4 3 2 1
PER TEND MPB
0 0 1 0
R/(W)* R R
Multiprocessor Bit Transfer
0
1
Multiprocessor Bit
0 [Clearing condition]
When data with a 0 multiprocessor bit is received
1 [Setting condition]
When data with a 1 multiprocessor bit is received
Transmit End
[Clearing conditions]
0
• When 0 is written to TDRE after reading TDRE = 1
• When the DMAC or DTC is activated by a TXI interrupt
and write data to TDR
1 [Setting conditions]
• On reset, or in standby mode or module stop mode
• When the TE bit in SCR is 0 and the ERS bit is 0
• When TDRE = 1 and ERS = 0 (normal transmission) 2.5 etu
after a 1-byte serial character is sent when GM = 0
• When TDRE = 1 and ERS = 0 (normal transmission) 1.0 etu
after a 1-byte serial character is sent when GM = 1
Note: etu: Elementary Time Unit (time for transfer of 1 bit)
Parity Error
0
[Clearing condition]
When 0 is written to PER after reading PER = 1
[Setting condition]
1
When, in reception, the number of 1 bits in the receive data plus the parity bit
does not match the parity setting (even or odd) specified by the O/E bit in SMR
Smart Card Interface 1
0
MPBT
0
R/W
Data with a 0 multiprocessor bit is transmitted
Data with a 1 multiprocessor bit is transmitted
Rev.6.00 Oct.28.2004 page 925 of 1016
REJ09B0138-0600H