L9960 datasheet(80/95 Pages) STMICROELECTRONICS

80 / 95 page

Functional description

L9960, L9960T

80/95

DS11115 Rev 10

4.9.7

Communication check

The purpose of this SPI communication self-check is to detect errors in the SPI

communication from the µC.

In case of no communication or of communication failure into the defined time frame, the

bridge is put into tri-state.

After the RESET state release, the communication check time-out timer Tcc is started by

NDIS HIGH and DIS LOW from a pre-loaded value:



If NDIS = '0' and DIS='1' when the RESET state is released, the pre-load is Tcc



If NDIS='1' and DIS='0' when the RESET state is released, the pre-load is Tcc*2 for the

first communication, Tcc for the next communications.

In case the timer has expired (time-out), a status bit is registered CC_latch.

Note:

Available in D9 bit position in SPI answer frame 7e.

The communication check can be disabled by SPI via dedicated bit Config_CC.

Note:

(-) available in D7 bit position in SPI answer frame 2.

The status of config register is inverted in a status bit.

Note:

(-) available in the R10 bit position in SPI answer frame 7e.

Table 93. CC_latch

Bit config

Description

Condition

Communication Check Fail

Communication Check Pass or Disable

Default value

Table 94. Config_CC

Bit config

Description

Condition

Disable communication check

enable communication check

Reset value

Table 95. Config_CC_state_echo7

Bit config

Description

Condition

echo communication check active

Default value

echo communication check inactive

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