PCA9665D datasheet(57/91 Pages) PHILIPS

57 / 91 page

PCA9665_2

Product data sheet

Rev. 02 — 7 December 2006

57 of 91

NXP Semiconductors

PCA9665

Fm+ parallel bus to I2C-bus controller

8.8 Miscellaneous states

There are four I2CSTA codes that do not correspond to a deﬁned PCA9665 state (see

Table 46). These are discussed in Section 8.8.1 through Section 8.8.4.

8.8.1 I2CSTA = F8h

This status code indicates that the PCA9665 is in an idle state and that no relevant

information is available because the serial interrupt ﬂag, SI, is not yet set. This occurs on a

STOP condition or during a hardware or software reset event and when the PCA9665 is

not involved in a serial transfer.

8.8.2 I2CSTA = 00h

This status code indicates that a bus error has occurred during a serial transfer. A bus

error is caused when a START or STOP condition occurs at an illegal position in the

format frame. Examples of such illegal positions are during the serial transfer of an

address byte, a data byte, or an acknowledge bit. A bus error may also be caused when

external interference disturbs the internal PCA9665 signals. When a bus error occurs, SI

is set. To recover from a bus error, the microcontroller must send an external hardware or

software reset signal to reset the PCA9665.

8.8.3 I2CSTA = 70h

This status code indicates that the SDA line is stuck LOW when the PCA9665, in master

mode, is trying to send a START condition.

Table 46.

Miscellaneous states

Status

code

(I2CSTA)

Status of the I2C-bus

and the PCA9665

Application software response

Next action taken by PCA9665

To/from I2CDAT

To I2CCON

STA STO SI

MODE

F8h

On hardware or

software reset or

STOP

No I2CDAT action 1

Go into master mode; send START

No I2CDAT action 0

No recognition of own slave

address. General Call address will

be recognized if GC = 1.

No I2CDAT action 0

Will recognize own slave address.

General Call address will be

recognized if GC = 1.

70h

Bus error

SDA stuck LOW

No I2CDAT action No I2CCON action

Hardware or software reset of the

PCA9665 (requires reset to return

to state F8h)

78h

Bus error

SCL stuck LOW

No I2CDAT action No I2CCON action

Hardware or software reset of the

PCA9665 (requires reset to return

to state F8h)

FCh

Illegal value in

I2CCOUNT

No I2CDAT action No I2CCON action

Program a valid value in

I2CCOUNT: BC[6:0] between 1 and

68.

00h

Bus error during

master or slave mode,

due to illegal START

or STOP condition

No I2CDAT action No I2CCON action

Hardware or software reset of the

PCA9665 (requires reset to return

to state F8h)

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