Hitachi H8/3048 Hardware Manual page 807

SSR—Serial Status Register
Bit 7
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TDRE
Initial value 1
Read/Write R/(W)
Parity error
0 [Clearing conditions]
Reset or transition to standby mode.
Read PER when PER = 1, then write 0
in PER.
1 [Setting condition]
Parity error: (parity of receive data does
not match parity setting O/E bit in SMR)
Framing error (for SCI0)
0 [Clearing conditions]
Reset or transition to standby mode.
Read FER when FER = 1, then write 0 in FER.
1 [Setting condition]
Framing error (stop bit is 0)
Receive data register full
0 [Clearing conditions]
Reset or transition to standby mode.
Read RDRF when RDRF = 1, then write 0 in
RDRF.
The DMAC reads data from RDR.
1 [Setting condition]
Serial data is received normally and transferred
from RSR to RDR
Transmit data register empty
0 [Clearing conditions]
Read TDRE when TDRE = 1, then write 0 in TDRE.
The DMAC writes data in TDR.
1 [Setting conditions]
Reset or transition to standby mode.
TE is 0 in SCR
Data is transferred from TDR to TSR, enabling new
data to be written in TDR.
Note: Only 0 can be written, to clear the flag.
*
6 5
RDRF ORER FER/ERS
0 0
* R/(W) * R/(W) *
Multiprocessor bit
0 Multiprocessor bit value in
receive data is 0
1 Multiprocessor bit value in
receive data is 1
800
H'B4
4 3 2
PER TEND
0 0 1
R/(W) * R/(W) * R
Multiprocessor bit transfer
0 Multiprocessor bit value in
transmit data is 0
1 Multiprocessor bit value in
transmit data is 1
Transmit end
0 [Clearing conditions]
Read TDRE when TDRE = 1, then write 0 in TDRE.
The DMAC writes data in TDR.
1 [Setting conditions]
Reset or transition to standby mode.
TE is cleared to 0 in SCR and FER/ERS is
cleared to 0.
TDRE is 1 when last bit of 1-byte serial character
is transmitted.
Error signal status (for smart card interface)
0 [Clearing conditions]
Reset or transition to standby mode.
Read ERS when ERS = 1, then write 0 in ERS.
1 [Setting condition]
A low error signal is received.
Overrun error
0 [Clearing conditions]
Reset or transition to standby mode.
Read ORER when ORER = 1, then write 0 in
ORER.
1 [Setting condition]
Overrun error (reception of next serial data
ends when RDRF = 1)
SCI0
0
1
MPB MPBT
0 0
R R/W