HD6432160 RENESAS [Renesas Technology Corp], HD6432160 Datasheet - Page 387

• Manufacturer Part Number: HD6432160
• Description: Hitachi 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

15.3.7
SSR is a register containing status flags of the SCI and multiprocessor bits for transfer. TDRE,
RDRF, ORER, PER, and FER can only be cleared.
Bit
7
6
5
Bit Name
TDRE
RDRF
ORER
Serial Status Register (SSR)
Initial Value
1
0
0
R/W
R/(W)*
R/(W)*
R/(W)*
Description
Transmit Data Register Empty
Indicates whether TDR contains transmit data.
[Setting conditions]
[Clearing conditions]
Receive Data Register Full
Indicates that receive data is stored in RDR.
[Setting condition]
[Clearing conditions]
The RDRF flag is not affected and retains its
previous value when the RE bit in SCR is cleared
to 0.
Overrun Error
[Setting condition]
[Clearing condition]
When the TE bit in SCR is 0
When data is transferred from TDR to TSR
and TDR is ready for data write
When 0 is written to TDRE after reading TDRE
= 1
When a TXI interrupt request is issued
allowing the DTC to write data to TDR
When serial reception ends normally and
receive data is transferred from RSR to RDR
RDRF = 1
When an RXI interrupt request is issued
allowing the DTC to read data from RDR
When the next data is received while RDRF =
1
When 0 is written to ORER after reading
ORER = 1
When 0 is written to RDRF after reading
Rev. 2.0, 08/02, page 347 of 788