L6474PD View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6474PD' PDF : 53 Pages View PDF
Programming manual
L6474
The OSC_SEL and EXT_CLK bits set the system clock source:
EXT_CLK OSC_SEL[20]
0
000
0
001
0
010
0
011
Table 23. Oscillator management
Clock source
OSCIN
Internal oscillator: 16 MHz
Unused
1
000
Internal oscillator: 16 MHz
Unused
1
001
Internal oscillator: 16 MHz
Unused
1
010
Internal oscillator: 16 MHz
Unused
1
011
Internal oscillator: 16 MHz
Unused
0
1
0
0 External crystal or resonator: 8 MHz
Crystal/resonator
driving
0
1
0
1 External crystal or resonator: 16 MHz
Crystal/resonator
driving
0
1
1
0 External crystal or resonator: 24 MHz
Crystal/resonator
driving
0
1
1
1 External crystal or resonator: 32 MHz
Crystal/resonator
driving
1
1
0
0
Ext. clock source: 8 MHz
(Crystal/resonator driver disabled)
Clock source
1
1
0
1
Ext. clock source: 16 MHz
(Crystal/resonator driver disabled)
Clock source
1
1
1
0
Ext. clock source: 24 MHz
(Crystal/resonator driver disabled)
Clock source
1
1
1
1
Ext. clock source: 32 MHz
(Crystal/resonator driver disabled)
Clock source
OSCOUT
Unused
Supplies a 2 MHz
clock
Supplies a 4 MHz
clock
Supplies a 8 MHz
clock
Supplies a 16 MHz
clock
Crystal/resonator
driving
Crystal/resonator
driving
Crystal/resonator
driving
Crystal/resonator
driving
Supplies inverted
OSCIN signal
Supplies inverted
OSCIN signal
Supplies inverted
OSCIN signal
Supplies inverted
OSCIN signal
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:
OC_SD
1
0
Table 24. Overcurrent event
Overcurrent event
Bridges shut down
Bridges do not shut down
The POW_SR bits set the slew rate value of power bridge output:
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DocID022529 Rev 4
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