HD6413003RF Datasheet, PDF (483/715 Pages) Renesas Technology Corp – Microcontroller (MCU)

Receiving Multiprocessor Serial Data: Figure 13-12 shows a sample flowchart for receiving
multiprocessor serial data and indicates the procedure to follow.
Initialize
1
Start receiving
Set MPIE bit to 1 in SCR
2
Read ORER and FER flags in SSR
FER ∨ PRER = 1
Yes
No
Read RDRF flag in SSR
3
No
RDRF = 1?
Yes
Read receive data from RDR
No
Own ID?
Yes
1. SCI initialization: the receive data function
of the RxD pin is selected automatically.
2. ID receive cycle: set the MPIE bit to 1 in SCR.
3. SCI status check and ID check: read SSR,
check that the RDRF flag is set to 1, then read
data from RDR and compare with the
processor’s own ID. If the ID does not match,
set the MPIE bit to 1 again and clear the
RDRF flag to 0. If the ID matches, clear the
RDRF flag to 0.
4. SCI status check and data receiving: read
SSR, check that the RDRF flag is set to 1,
then read data from RDR.
5. Receive error handling and break detection:
if a receive error occurs, read the
ORER and FER flags in SSR to identify the error.
After executing the necessary error handling,
clear the ORER and FER flags both to 0.
Receiving cannot resume while either the ORER
or FER flag remains set to 1. When a framing
error occurs, the RxD pin can be read to detect
the break state.
Read ORER and FER flags in SSR
FER ∨ ORER = 1
No
Read RDRF flag in SSR
RDRF = 1?
Yes
Read receive data from RDR
No
No
Finished receiving?
Yes
Clear RE bit to 0 in SCR
Yes
4
No
5
Error handling
(continued on next page)
End
Figure 13-12 Sample Flowchart for Receiving Multiprocessor Serial Data (1)
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