H8SLASH3003 datasheet(485/715 Pages) RENESAS

485 / 715 page

Figure 13-13 shows an example of SCI receive operation using a multiprocessor format.

Figure 13-13 Example of SCI Receive Operation (8-Bit Data with Multiprocessor Bit and

One Stop Bit)

Start

bit

Stop

bit

Data (ID1)

MPB

Start

bit

Stop

bit

Data (data1)

MPB

Idle (mark)

state

MPIE

RDRF

RDR value

ID1

RXI request

(multiprocessor

interrupt), MPIE = 0

RXI handler reads

RDR data and clears

RDRF flag to 0

Not own ID, so

MPIE bit is set

to 1 again

No RXI request,

RDR not updated

a. Own ID does not match data

Start

bit

Stop

bit

Data (ID2)

MPB

Start

bit

Stop

bit

Data (data2)

MPB

Idle (mark)

state

MPIE

RDRF

RDR value

ID2

RXI request

(multiprocessor

interrupt), MPIE = 0

RXI interrupt handler

reads RDR data and

clears RDRF flag to 0

Own ID, so receiving

continues, with data

received by RXI

interrupt handler

MPIE bit is set

to 1 again

b. Own ID matches data

ID1

Data 2

467

H8/3003 Datasheet(PDF) 485 Page - Renesas Technology Corp

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