r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 1050

• 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 1022 of 1270
REJ09B0466-0100
[1]
[2]
[3]
[4]
Note: Hatching boxes represent SSU internal operations.
Data transferred from SSTDR to SSTRSR
Set TDRE to 1 to start transmission
Confirm that TEND is cleared to 0
Write transmit data to SSTDR
TDRE automatically cleared
Consecutive data transmission?
Clear TE in SSER to 0
Read TDRE in SSSR
Read TEND in SSSR
quantum elapsed?
End transmission
Figure 19.6 Flowchart Example of Data Transmission (SSU Mode)
Clear TEND to 0
Initial setting
One bit time
TDRE = 1?
TEND = 1?
Yes
Yes
Yes
No
Start
Yes
No
No
No
[1] Initial setting:
[2] Check that the SSU state and write transmit data:
[3] Procedure for consecutive data transmission:
[4] Procedure for data transmission end:
Specify the transmit data format.
Write transmit data to SSTDR after reading and confirming
that the TDRE bit is 1. The TDRE bit is automatically cleared
to 0 and transmission is started by writing data to SSTDR.
meaning that SSTDR is ready to be written to. After that, data
can be written to SSTDR. The TDRE bit is automatically
cleared to 0 by writing data to SSTDR.
To end data transmission, confirm that the TEND bit is cleared
to 0. After completion of transmitting the last bit, clear the TE
bit to 0.
To continue data transmission, confirm that the TDRE bit is 1