r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 550

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
Figure 25.9
Note:
(4)
(5)
(1)
(2)
(3)
(6)
1. Write 0 after reading 1 to set the TEND bit to 0.
SSSR register
SSER register
Communication Mode)
Sample Flowchart of Data Transmission/Reception (Clock Synchronous
Write transmit data to SSTDR register
Read receive data in SSRDR register
Read TDRE bit in SSSR register
Read RDRF bit in SSSR register
Read TEND bit in SSSR register
No
transmission
RDRF = 1 ?
TEND = 1 ?
Initialization
TDRE = 1 ?
continues?
Start
Data
End
TEND bit ← 0
RE bit ← 0
TE bit ← 0
Yes
Yes
No
Yes
(2)
No
No
Yes
(1)
25. Synchronous Serial Communication Unit (SSU)
(2) Confirm that the RDRF bit is set to 1. If the RDRF
(3) Determine whether the data transmission
(4) When the data transmission is completed, the
(5) Set the TEND bit to 0 and bits RE and TE in
(6) the SSER register to 0 before ending transmit/
(1) After reading the SSSR register and confirming
bit is set to 1, read the receive data in the SSRDR
register. When the SSRDR register is read, the
RDRF bit is automatically set to 0.
continues
TEND bit in the SSSR register is set to 1.
that the TDRE bit is set to 1, write the transmit
data to the SSTDR register. When the transmit
data is written to the SSTDR register, the TDRE
bit is automatically set to 0.
receive mode.
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