Renesas SH7709S Manual Do Utilizador

Rev. 5.00, 09/03, page 473 of 760

RDRF

MPIE

RDR

value

Example:  Own ID matches data

ID1

ID2

Data2

0

1

1

1

1

0

1

MPB

MPB

Serial

data

Start

bit

Data

(ID2)

Data

(Data 2)

Stop

bit

Start

bit

Stop

bit

Idle (mark)
state

D

0

D

1

D

7

D

0

D

1

D

7

0

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

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

ID is that of station,
so reception continues 
unchanged and data 
is received by RXI 
interrupt handler

MPIE bit
set to 1
again