ADE5166 datasheet(140/148 Pages) AD

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ADE5166/ADE5169/ADE5566/ADE5569

Preliminary Technical Data

Rev. PrB | Page 140 of 148

I2C RECEIVE AND TRANSMIT FIFOS

The I2C peripheral has a 4-byte receive FIFO and a 4-byte

transmit FIFO. The buffers reduce the overhead associated with

using the I2C peripheral. Figure 94 shows the operation of the

I2C receive and transmit FIFOs.

The Tx FIFO can be loaded with four bytes to be transmitted to

the slave at the beginning of a write operation. When the transmit

FIFO is empty, the I2C transmit interrupt flag is set, and the PC

vectors to the I2C interrupt vector if this interrupt is enabled. If

a new byte is not loaded into the Tx FIFO before it is needed in

the transmit shift register, the communication stops. An error,

such as not receiving an acknowledge, also causes the communica-

tion to terminate. In case of an error during a write operation,

the Tx FIFO is flushed.

The Rx FIFO allows four bytes to be read in from the slave

before the MCU has to read the data. A receive interrupt can

be generated after each byte is received or when the Rx FIFO

is full. If the peripheral is reading from a slave address, the

communication stops once the number of received bytes equals

the number set in I2CRCT[4:0]. An error, such as not receiving

an acknowledge, also causes the communication to terminate.

I2CTx

4-BYTE FIFO

MOV I2CTx, TxDATA1

MOV I2CTx, TxDATA2

MOV I2CTx, TxDATA3

MOV I2CTx, TxDATA4

CODE TO FILL Tx FIFO:

TRANSMIT SHIFT REGISTER

I2CRx

RECEIVE SHIFT REGISTER

4-BYTE FIFO

CODE TO READ Rx FIFO:

MOV A, I2CRx; RESULT: A = RxDATA1

MOV A, I2CRx; RESULT: A = RxDATA2

MOV A, I2CRx; RESULT: A = RxDATA3

MOV A, I2CRx; RESULT: A = RxDATA4

TxDATA1

TxDATA2

TxDATA3

TxDATA4

RxDATA4

RxDATA3

RxDATA2

RxDATA1

Figure 94. I2C FIFO Operation

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