HD6473032F16 Datasheet, PDF (507/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 13 Serial Communication Interface
• 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
Yes
FER ∨ ORER = 1
No
Read RDRF flag in SSR
3
No
RDRF = 1?
Yes
Read receive data from RDR
No
Own ID?
Yes
Read ORER and FER flags in SSR
FER ∨ ORER = 1
No
Read RDRF flag in SSR
Yes
4
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.
No
RDRF = 1?
Yes
Read receive data from RDR
No
No
Finished receiving?
Yes
Clear RE bit to 0 in SCR
5
Error handling
(continued on next page)
End
Figure 13.12 Sample Flowchart for Receiving Multiprocessor Serial Data (1)
Rev. 3.00 Mar 21, 2006 page 477 of 814
REJ09B0302-0300