HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 641

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

14.2.7
Note: * Only 0 can be written, to clear the flag.
SSR is an 8-bit register containing status flags that indicate the operating status of the SCI, and
multiprocessor bits.
SSR can be read or written to by the CPU at all times. However, 1 cannot be written to flags
TDRE, RDRF, ORER, PER, and FER. Also note that in order to clear these flags they must be
read as 1 beforehand. The TEND flag and MPB flag are read-only flags and cannot be modified.
SSR is initialized to H'84 by a reset, and in standby mode or module stop mode.
Bit 7—Transmit Data Register Empty (TDRE): Indicates that data has been transferred from
TDR to TSR and the next serial data can be written to TDR.
Bit 7
TDRE
0
1
Note: * The DMAC is not supported in the H8S/2321.
Bit
Initial value :
R/W
Serial Status Register (SSR)
Description
[Clearing conditions]
•
•
[Setting conditions]
•
•
:
:
When 0 is written to TDRE after reading TDRE = 1
When the DMAC * or DTC is activated by a TXI interrupt and writes data to TDR
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
R/(W) *
RDRF
6
0
R/(W) *
ORER
5
0
R/(W) *
Section 14 Serial Communication Interface (SCI)
FER
4
0
Rev.6.00 Sep. 27, 2007 Page 611 of 1268
R/(W) *
PER
3
0
TEND
R
2
1
REJ09B0220-0600
MPB
R
1
0
(Initial value)
MPBT
R/W
0
0