h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 329

• Manufacturer Part Number: h8s-2172
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
• Manufacturer: Renesas Electronics Corporation.

11.3.7
SSR is a register containing status flags of the SCI. Flags TDRE, RDRF, ORER, PER, and FER
can only be cleared.
Bit
7
6
Bit Name
TDRE
RDRF
Serial Status Register (SSR)
Initial
Value
1
0
R/W
R/(W)* Transmit Data Register Empty
R/(W)* Receive Data Register Full
Description
Indicates whether TDR contains transmit data.
[Setting conditions]
•
•
[Clearing condition]
•
Indicates that the received data is stored in RDR.
[Setting condition]
•
[Clearing condition]
•
The RDRF flag is not affected and retains its previous
value when the RE bit in SCR is cleared to 0. Exercise
care because if reception of the next data is completed
while the RDRF flag is set to 1, an overrun error occurs
and receive data will be lost.
When the TE bit in SCR is 0
When data is transferred from TDR to TSR, and
data writing to TDR is enabled.
When 0 is written to TDRE after reading TDRE = 1
When serial reception ends normally and receive
data is transferred from RSR to RDR
When 0 is written to RDRF after reading RDRF = 1
Rev. 2.00, 03/04, page 297 of 534