Renesas SH7709S Manual Do Utilizador

Rev. 5.00, 09/03, page 472 of 760

Figure 14.16 shows an example of SCI receive operation using a multiprocessor format.

RDRF

MPIE

RDR

value

ID1

RXI interrupt request
(multiprocessor interrupt)
generated, MPIE = 0

Example:  Own ID does not match data

RXI interrupt handler 
reads RDR data and  
clears RDRF bit to 0

ID is not station's
ID, so MPIE bit is
set to 1 again

No RXI interrupt
generated;
RDR state
is maintained

0

1

1

1

1

0

1

Stop

bit

MPB

Serial

data

Start

bit

Data

(ID1)

Data

(data 1)

Start

bit

MPB

Stop

bit

Idle (mark)
state

D

0

D

1

D

7

D

0

D

1

D

7

0