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RL78/G1A 

 

CHAPTER  13   SERIAL  INTERFACE  IICA 

 

DI

SET1 STT0

Define communication
reservation

Wait

MSTS0 = 0?

 (Communication reservation)

Yes

No

 (Generate start condition)

Cancel communication
reservation

MOV IICA0, #

××H

EI

Sets STT0 flag (communication reservation) 

Defines that communication reservation is in effect
(defines and sets user flag to any part of RAM)

Secures wait time

 by software.

Confirmation of communication reservation

Clear user flag

IICA0 write operation

 

 

Notes 1.  The wait time (f

MCK

) is calculated as follows. 

(IICWL0 setting value + IICWH0 setting value + 4) + t

F

 

× 2 × f

MCK

 [clocks] 

 2.  The communication reservation operation executes a write to the IICA shift register 0 (IICA0) when a 

stop condition interrupt request occurs. 

 

Remark   STT0:   Bit 1 of IICA control register 00 (IICCTL00) 

 

MSTS0:  Bit 7 of IICA status register 0 (IICS0) 

 

IICA0:   IICA shift register 0 

 

IICWL0:  IICA low-level width setting register 0 

 IICWH0: 

 

IICA high-level width setting register 0 

 

t

F

:  

SDAA0 and SCLA0 signal falling times 

 

f

MCK

: 

IICA operation clock frequency 

 

R01UH0305EJ0200  Rev.2.00 

 

 

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Jul 04, 2013