r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 522

• 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 23.19
23.6.1
(1)
(2)
(3)
Figure 23.19 shows a Sample Flowchart of Multiprocessor Data Transmission. Set the MPBT bit in the U2TB
register to 1 for ID transmission cycles. Set the MPBT bit in the U2TB register to 0 for data transmission cycles.
Other operations are the same as in universal asynchronous receiver/transmitter mode (UART mode).
Set the MPBT bit in the U2TB register
Read the TI bit in the U2C1 register
Multiprocessor Transmission
in the U2C1 register to 0
Write transmit data to
Read the TXEPT bit
in the U2C0 register
data transmission?
the U2TB register
Sample Flowchart of Multiprocessor Data Transmission
Set the TE bit
TXEPT = 1?
Continue
TI = 1?
Start
End
Yes
Yes
No
Yes
No
No
(1) Read the U2C1 register to confirm that the TI bit is
(2) When transmission completes, the TXEPT bit is set
(3) To continue data transmission, read that the TI bit is 1
set to 1. Then set the MPBT bit in the U2TB register
to 0 or 1 and write transmit data to the U2TB
register.
Writing data to the U2TB register sets the TI bit to 0
automatically.
to 1 automatically.
and write data to the U2TB register. Writing data to
the U2TB register sets the TI bit to 0 automatically.
23. Serial Interface (UART2)
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