Nxp-semiconductors PCA9665 Manual do Utilizador descarregar pdf (Página 53)

Product data sheet Rev. 02 — 7 December 2006 53 of 91

NXP Semiconductors

PCA9665

Fm+ parallel bus to I

C-bus controller

Remark: Request to send or receive a number of bytes equal to 0 or higher than 68

(BC[6:0] = 000 0000 or BC[6:0] > 100 0100) will cause no data to be transferred and an

interrupt to be generated after writing to the I2CCON register. I2CSTA status register is

loaded with FCh that indicates that an invalid value was requested to be loaded in

I2CCOUNT.

8.7 Acknowledge management (I

C-bus addresses and data) in Byte and

Buffered modes

Data acknowledge/not acknowledge management can be controlled on a byte basis (Byte

mode) or on a sequence basis (Buffered mode). The PCA9665 can be programmed to

respond (ACK) or not (NACK) to two different I

C-bus addresses. Table 43 shows how this

is performed based on the different control bits (AA, GC, LB and MODE) and the different

modes.

[1] Assumption is that Data Received follows the address (as deﬁned in column “Address”); valid for slave

mode only.

[2] Unless the master sends a STOP command before.

Table 43. Own slave address, General Call address, and Data acknowledge management

AA GC LB MODE Address Data received

[1]

Master mode: the PCA9665 generates a START command and controls the I

C-bus

0 X X 0 not applicable data (each byte) = NACK

1 X X 0 not applicable data (each byte) = ACK

X X 0 1 not applicable all the bytes (BC[6:0] bytes) = ACK

X X 1 1 not applicable all the bytes except the last one

(BC[6:0] bytes − 1) = ACK;

last byte = NACK

Slave mode: I

C-bus message starting with the PCA9665’s Own Slave address

0 X X 0 Own address = NACK data (each byte) = NACK

1 X X 0 Own address = ACK data (each byte) = ACK

0 X 0 1 Own address = NACK all the bytes (≤ BC[6:0] bytes) = ACK

0 X 1 1 Own address = NACK all the bytes except the last one

(BC[6:0] bytes - 1) = ACK; last

byte=NACK

[2]

1 X 0 1 Own address = ACK all the bytes (≤ BC[6:0] bytes) = ACK

1 X 1 1 Own address = ACK all the bytes except the last one

(BC[6:0] bytes - 1) = ACK;

last byte = NACK

[2]

Slave mode: I

C-bus message starting with the General Call address

X 0 X 0 GC address = NACK data (each byte) = NACK

0 1 X 0 GC address = ACK data (each byte) = NACK

1 1 X 0 GC address = ACK data (each byte) = ACK

X 0 X 1 GC address = NACK data (each byte) = NACK

X 1 0 1 GC address = ACK all the bytes (≤ BC[6:0] bytes) = ACK

X 1 1 1 GC address = ACK all the bytes except the last one

(BC[6:0] bytes - 1) = ACK;

last byte = NACK

[2]

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 90 91

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