H8S2245 datasheet(494/818 Pages) RENESAS

494 / 818 page

Section 12 Serial Communication Interface (SCI)

Rev.3.00 Mar. 26, 2007 Page 452 of 772

REJ09B0355-0300

Figure 12.13 shows an example of SCI operation for multiprocessor format reception.

MPIE

RDR

value

Data (ID1)

Start

bit

MPB

Stop

bit

Start

bit

Data (Data1)

MPB

Stop

bit

RXI interrupt

request

(multiprocessor

interrupt)

generated

MPIE = 0

Idle state

(mark state)

RDRF

RDR data read

and RDRF flag

cleared to 0 in

RXI interrupt

service routine

If not this station's ID,

MPIE bit is set to 1

again

RXI interrupt request is

not generated, and RDR

retains its state

ID1

(a) Data does not match station's ID

MPIE

RDR

value

Data (ID2)

Start

bit

MPB

Stop

bit

Start

bit

Data (Data2)

MPB

Stop

bit

RXI interrupt

request

(multiprocessor

interrupt)

generated

MPIE = 0

Idle state

(mark state)

RDRF

RDR data read and

RDRF flag cleared

to 0 in RXI interrupt

service routine

Matches this station's ID,

so reception continues, and

data is received in RXI

interrupt service routine

MPIE bit set to 1

again

ID2

(b) Data matches station's ID

Data2

ID1

Figure 12.13 Example of SCI Operation in Reception

(Example with 8-Bit Data, Multiprocessor Bit, One Stop Bit)

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