r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 1036

• Manufacturer Part Number: r4f2426
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 19 Synchronous Serial Communication Unit (SSU)
Rev. 1.00 Sep. 19, 2008 Page 1008 of 1270
REJ09B0466-0100
Bit
3
2
1
Bit Name
TEND
TDRE
RDRF
Initial
Value
1
1
0
R/W
R
R/W
R/W
Description
Transmit End
[Setting condition]
•
•
[Clearing conditions]
•
•
Transmit Data Empty
Indicates whether or not SSTDR contains transmit data.
[Setting conditions]
•
•
[Clearing conditions]
•
•
Receive Data Register Full
Indicates whether or not SSRDR contains receive data.
[Setting condition]
•
[Clearing conditions]
•
•
When the last bit of transmit data is transmitted
while the TENDSTS bit in SSCR2 is cleared to 0
and the TDRE bit is set to 1
After the last bit of transmit data is transmitted while
the TENDSTS bit in SSCR2 is set to 1 and the
TDRE bit is set to 1
When writing 0 after reading TEND = 1
(When the CPU is used to clear this flag by writing 0
while the corresponding interrupt is enabled, be
sure to read the flag after writing 0 to it.)
When writing data to SSTDR
When the TE bit in SSER is 0
When data is transferred from SSTDR to SSTRSR
and SSTDR is ready to be written to.
When writing 0 after reading TDRE = 1
(When the CPU is used to clear this flag by writing 0
while the corresponding interrupt is enabled, be
sure to read the flag after writing 0 to it.)
When writing data to SSTDR with TE = 1
When receive data is transferred from SSTRSR to
SSRDR after successful serial data reception
When writing 0 after reading RDRF = 1
(When the CPU is used to clear this flag by writing 0
while the corresponding interrupt is enabled, be
sure to read the flag after writing 0 to it.)
When reading receive data from SSRDR