NXP Semiconductors PCA9665 - page 38

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PCA9665_2 © NXP B.V. 2006. All rights reserved. Product data sheet Rev. 02 — 7 December 2006 38 of 91 NXP Semiconductors PCA9665
Fm+ parallel bus to I2C-bus controller
Table 36. Master Receiver Buffered mode (MODE= 1)
Status
code
(I2CSTA)
Status of the
I2C-bus and the
PCA9665
Application software response Next action taken by the PCA9665
To/from I2CDAT To/from I2CCOUNT To I2CCON
LB BC[6:0] STA STO SI AA MODE
08h A START condition
has been transmitted Load SLA+R 0 Totalnumber ofbytes to be received X X 0 X 1 SLA+R will be transmitted.
IfACK bit received, BC[6:0] data bytes will be
received, ACK bit will be returned for all of
them.
1 Totalnumber of bytes
to be received X X 0 X 1 SLA+R will be transmitted.
IfACK bit received, BC[6:0] data bytes will be
received, ACK bit will be returned for all of
them, except for the last one where NACK bit
will be returned.
10h A repeated START
condition has been
transmitted
Load SLA+R or 0 Totalnumber ofbytes
to be received X X 0 X 1 SLA+R will be transmitted.
IfACK bit received, BC[6:0] data bytes will be
received, ACK bit will be returned for all of
them.
1 Totalnumber of bytes
to be received X X 0 X 1 SLA+R will be transmitted.
IfACK bit received, BC[6:0] data bytes will be
received, ACK bit will be returned for all of
them, except for the last one where NACK bit
will be returned.
LoadSLA+W and
the data bytes X Totalnumberof bytes to be transmitted
(= SLA+W + number
of data bytes)
X X 0 X 1 SLA+W will be transmitted;
PCA9665 will be switched to Master
Transmitter Buffered mode.
38h Arbitration lost in
NACK bit NoI2CDATaction or XX 0 0 0X1 I
2C-bus will be released;
PCA9665 will enter slave mode.
No I2CDAT action X X 1 0 0 X 1 A START condition will be transmitted when
the bus becomes free.
48h SLA+R has been
transmitted;
NACK has been
received
NoI2CDATaction
or X X 1 0 0 X 1 Repeated START condition will be transmitted.
NoI2CDATaction
or 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.