HD64F3039F18 Datasheet, PDF (399/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 11 Serial Communication Interface
Figure 11.13 shows an example of SCI receive operation using a multiprocessor format.
MPIE
RDRF
Start
1
bit Data (ID1)
0 D0 D1
Stop Start
MPB bit bit Data (data1)
D7 1 1 0 D0 D1
Stop
MPB bit
D7 0 1
1
Idle (mark)
state
RDR value
ID1
RXI request
RXI handler reads
Not own ID, so
(multiprocessor
RDR data and clears MPIE bit is set
interrupt), MPIE = 0 RDRF flag to 0
to 1 again
No RXI request,
RDR not updated
a. Own ID does not match data
MPIE
RDRF
Start
1
bit Data (ID2)
0 D0 D1
Stop Start
MPB bit bit
Stop
Data (data2) MPB bit
1
D7 1 1 0 D0 D1
D7 0 1 Idle (mark)
state
RDR value
ID1
ID2
Data 2
RXI request
RXI interrupt handler Own ID, so receiving MPIE bit is set
(multiprocessor
reads RDR data and continues, with data to 1 again
interrupt), MPIE = 0 clears RDRF flag to 0 received by RXI
interrupt handler
b. Own ID matches data
Figure 11.13 Example of SCI Receive Operation (8-Bit Data with Multiprocessor Bit and
One Stop Bit)
Rev.3.00 Mar. 26, 2007 Page 375 of 682
REJ09B0353-0300