HD6412340 HITACHI [Hitachi Semiconductor], HD6412340 Datasheet - Page 834

• Manufacturer Part Number: HD6412340
• Description: H8S/2345 F-ZTAT Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

SSR1—Serial Status Register 1
Bit
Initial value
Read/Write
Note: * Can only be written with 0 for flag clearing.
Transmit Data Register Empty
0
1
[Clearing condition]
• When 0 is written to TDRE after reading TDRE = 1
• When the DTC is activated by a TXI interrupt and writes data to TDR
[Setting condition]
• When the TE bit in SCR is 0
• When data is transferred from TDR to TSR and data can be written to TDR
:
:
:
R/(W)*
TDRE
7
1
Receive Data Register Full
0
1
R/(W)*
RDRF
[Clearing condition]
• When 0 is written to RDRF after reading RDRF = 1
• When the DTC is activated by an RXI interrupt and reads data from RDR
[Setting condition]
When serial reception ends normally and receive data is transferred from RSR to RDR
6
0
Overrun Error
0
1
R/(W)*
ORER
[Clearing condition]
When 0 is written to ORER after reading ORER = 1
[Setting condition]
When the next serial reception is completed while RDRF = 1
5
0
Note: Clearing the TE bit in SCR to 0 does not affect the ERS flag, which retains its prior state.
Error Signal Status
0
1
R/(W)*
[Clearing condition]
• On reset, or in standby mode or module stop mode
• When 0 is written to ERS after reading ERS =1
[Setting conditions]
When the error signal is sampled at the low level
ERS
4
0
Parity Error
0
1
R/(W)*
[Clearing condition]
When 0 is written to PER after reading PER = 1
[Setting condition]
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
PER
3
0
Note: etu: Elementary Time Unit (the time taken to transmit one bit)
Transmit End
0
1
TEND
[Clearing condition]
• When 0 is written to TDRE after reading TDRE = 1
• When the DTC is activated by a TXI interrupt and writes data to TDR
[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
• When TDRE = 1 and ERS = 0 (normal transmission) 1.0 etu
R
2
1
after a 1-byte serial character is transmitted when GM = 0
after a 1-byte serial character is transmitted when GM = 1
Multiprocessor Bit
0
1
MPB
[Clearing condition]
When data with a 0 multiprocessor bit is received
[Setting conditions]
When data with a 1 multiprocessor bit is received
R
H'FF84
1
0
Multiprocessor Bit Transfer
0
1
MPBT
R/W
Data with a 0 multiprocessor bit is transmitted
Data with a 1 multiprocessor bit is transmitted
0
0
Smart Card Interface 1
825