H8SLASH3021 datasheet(401/712 Pages) RENESAS

401 / 712 page

11. Serial Communication Interface

Rev.2.00 Mar. 22, 2007 Page 377 of 684

REJ09B0352-0200

Figure 11.13 shows an example of SCI receive operation using a multiprocessor format.

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

Figure 11.13 Example of SCI Receive Operation

(8-Bit Data with Multiprocessor Bit and One Stop Bit)

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