L6474 datasheet(40/51 Pages) STMICROELECTRONICS

40 / 51 page

Programming manual

L6474

40/51

Doc ID 022529 Rev 2

The OSC_SEL and EXT_CLK bits set the system clock source:

The OC_SD bit sets whether or not an overcurrent event causes the bridges to turn off; the

OCD flag in the status register is forced low anyway:

The POW_SR bits set the slew rate value of power bridge output:

Table 23.

Oscillator management

EXT_CLK OSC_SEL[2..0]

Clock source

OSCIN

OSCOUT

Internal oscillator: 16 MHz

Unused

Internal oscillator: 16 MHz

Unused

Supplies a 2 MHz

clock

Internal oscillator: 16 MHz

Unused

Supplies a 4 MHz

clock

Internal oscillator: 16 MHz

Unused

Supplies a 8 MHz

clock

Internal oscillator: 16 MHz

Unused

Supplies a 16 MHz

clock

External crystal or resonator: 8 MHz

Crystal/resonator driving

Crystal/resonator

driving

External crystal or resonator: 16

MHz

Crystal/resonator driving

Crystal/resonator

driving

External crystal or resonator: 24

MHz

Crystal/resonator driving

Crystal/resonator

driving

External crystal or resonator: 32

MHz

Crystal/resonator driving

Crystal/resonator

driving

Ext. clock source: 8 MHz

(Crystal/resonator driver disabled)

Clock source

Supplies inverted

OSCIN signal

Ext. clock source: 16 MHz

(Crystal/resonator driver disabled)

Clock source

Supplies inverted

OSCIN signal

Ext. clock source: 24 MHz

(Crystal/resonator driver disabled)

Clock source

Supplies inverted

OSCIN signal

Ext. clock source: 32 MHz

(Crystal/resonator driver disabled)

Clock source

Supplies inverted

OSCIN signal

Table 24.

Overcurrent event

OC_SD

Overcurrent event

Bridges shut down

Bridges do not shut down

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