HD64F2149YV datasheet(502/1075 Pages) RENESAS

502 / 1075 page

Section 15 Serial Communication Interface (SCI, IrDA)

Rev. 3.00 Jan 18, 2006 page 474 of 1044

REJ09B0280-0300

Figure 15.13 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

handling 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

handling routine

Matches this station’s ID,

so reception continues, and

data is received in RXI

interrupt handling routine

MPIE bit set to 1

again

ID2

(b) Data matches station’s ID

Data2

ID1

Figure 15.13 Example of SCI Operation in Reception

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

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