Nxp-semiconductors PCA9665 Manual do Utilizador descarregar pdf (Página 34)

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Product data sheet Rev. 02 — 7 December 2006 34 of 91

NXP Semiconductors

PCA9665

Fm+ parallel bus to I

C-bus controller

Table 35. Master Transmitter Buffered mode (MODE = 1)

Status

code

(I2CSTA)

Status of the

C-bus and the

PCA9665

Application software response Next action taken by the PCA9665

To/from I2CDAT To I2CCOUNT To I2CCON

LB BC[6:0] STA STO SI AA MODE

08h A START condition

has been

transmitted

Load SLA+W and

the data bytes

X Total number of bytes

to be transmitted

(= SLA+W + number

of data bytes)

X X 0 X 1 SLA+W will be transmitted. If ACK bit received,

data bytes will be transmitted until all of them

have been sent and an ACK has been received

for each of them or until a NACK bit is received.

10h A repeated START

condition has been

transmitted

Load SLA+W and

the data bytes or

X Total number of bytes

to be transmitted

(= SLA+W + number

of data bytes)

X X 0 X 1 SLA+W will be transmitted. If ACK bit received,

data bytes will be transmitted until all of them

have been sent and an ACK has been received

for each of them or until a NACK bit is received.

Load SLA+R X Total number of bytes

to be received

X X 0 X 1 SLA+R will be transmitted.

PCA9665 will be switched to Master Receiver

Buffered mode.

18h SLA+W has been

transmitted; ACK

has been received

Load the data

bytes or

X Total number of data

bytes to be

transmitted

0 0 0 X 1 Up to BC[6:0] data bytes will be transmitted (until

all of them have been sent and an ACK has

been received for each of them or until a NACK

bit is received).

no I2CDAT action

X X 1 0 0 X 1 Repeated START will be transmitted.

no I2CDAT action

X X 0 1 0 X 1 STOP condition will be transmitted.

STO ﬂag will be reset.

no I2CDAT action X X 1 1 0 X 1 STOP condition followed by a START condition

will be transmitted.

STO ﬂag will be reset.

20h SLA+W has been

transmitted; NACK

has been received

Load the data

bytes or

0 Total number of data

bytes to be

transmitted

0 0 0 X 1 Up to BC[6:0] data bytes will be transmitted (until

all of them have been sent and an ACK has

been received for each of them or until a NACK

bit is received).

no I2CDAT action

1 X 1 0 0 X 1 Repeated START will be transmitted.

no I2CDAT action

0 X 0 1 0 X 1 STOP condition will be transmitted;.

STO ﬂag will be reset.

no I2CDAT action 1 X 1 1 0 X 1 STOP condition followed by a START condition

will be transmitted.

STO ﬂag will be reset.

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 90 91

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