Freescale-semiconductor ColdFire MCF52210 Manual de usuario descargar pdf (Pagina 436)

I

2

C Interface

MCF52211 ColdFire® Integrated Microcontroller Reference Manual, Rev. 2

25-16 Freescale Semiconductor

Figure 25-14. Flow-Chart of Typical I

2

C Interrupt Routine

Clear

Master

Mode?

TX/Rx

?

Last Byte

Transmitted

?

RXAK= 0

?

End of

ADDR Cycle

(Master RX)

?

Write Next

Byte to I2DR

Switch to

Rx Mode

Dummy Read

from I2DR

Generate

STOP Signal

Read Data

from I2DR

And Store

Set TXAK =1

Generate

STOP Signal

2nd Last

Byte to be

Last

Byte to be

?

Arbitration

Lost?

Clear IAL

IAAS=1

?

IAAS=1

?

SRW=1

?

Tx/Rx

?

Set TX

Mode

Write Data

to I2DR

Set RX

Mode

Dummy Read

from I2DR

ACK from

Receiver

?

Tx Next

Byte

Read Data

from I2DR

and Store

Switch to

Rx Mode

Dummy Read

from I2DR

RTE

YN

Y

Y

Y

Y

Y

Y

Y

Y

Y

N

N

N

N

N

N

N

N

N

Y

TX RX

RX

TX

(WRITE)

(Read)

N

IIF

Address

Cycle

Data

Cycle

Read

Read?

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