3069RF-ZTAT Datasheet, PDF (519/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

Initialize
(1)
Start receiving
Set MPIE bit to 1 in SCR (2)
Read ORER and FER flags
in SSR
FER∨ORER = 1
Yes
No
Read RDRF flag in SSR (3)
No
RDRF = 1
Yes
Read RDRF flag in SSR
No
Own ID?
Yes
Read ORER and FER flags
in SSR
FER∨ORER = 1
Yes
No
Read RDRF flag in SSR
(1) SCI initialization:
the receive data input 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 it 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.
(4)
No
RDRF = 1
Yes
Read receive data from RDR
No
Finished receiving?
(5)
Yes
Clear RE bit to 0 in SCR
Error handling
(continued on next page)
<End>
Figure 13.12 Sample Flowchart for Receiving Multiprocessor Serial Data (1)
Rev. 5.0, 09/04, page 497 of 978