HD643303x Hitachi, HD643303x Datasheet - Page 529

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

SSR—Serial Status Register
Transmit data register empty
Note: Only 0 can be written, to clear the flag.
0
1
Receive data register full
Bit
Initial value
Read/Write
0
1
[Clearing conditions]
Read TDRE when TDRE = 1, then write 0 in TDRE.
[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.
*
[Clearing conditions]
Reset or transition to standby mode.
Read RDRF when RDRF = 1, then write 0 in
RDRF.
[Setting condition]
Serial data is received normally and transferred
from RSR to RDR
Framing error
0
1
[Clearing conditions]
Reset or transition to standby mode.
Read FER when FER = 1, then write 0
in FER.
[Setting condition]
Framing error (stop bit is 0)
Transmit end
0
1
R/(W)
TDRE
[Clearing conditions]
Read TDRE when TDRE = 1, then write 0 in TDRE.
[Setting conditions]
Reset or transition to standby mode.
TE is cleared to 0 in SCR.
TDRE is 1 when last bit of serial character is transmitted.
7
1
*
R/(W)
RDRF
6
0
*
Multiprocessor bit
0
1
ORER
R/(W)
Multiprocessor bit value in
receive data is 0
Multiprocessor bit value in
receive data is 1
5
0
*
514
R/(W)
FER
4
0
Parity error
Overrun error
0
1
0
1
*
[Clearing conditions]
Reset or transition to standby mode.
Read PER when PER = 1, then write 0 in
PER.
[Setting condition]
Parity error: (parity of receive data does not
match parity setting of O/
[Clearing conditions]
Reset or transition to standby mode.
Read ORER when ORER = 1, then write 0 in
ORER.
[Setting condition]
Overrun error (reception of next serial data
ends when RDRF = 1)
R/(W)
PER
3
0
*
H'B4
Multiprocessor bit transfer
TEND
0
1
R
2
1
Multiprocessor bit value in
transmit data is 0
Multiprocessor bit value in
transmit data is 1
E
MPB
in SMR)
R
1
0
MPBT
R/W
0
0
SCI