mc9s12xf512 Freescale Semiconductor, Inc, mc9s12xf512 Datasheet - Page 929

• Manufacturer Part Number: mc9s12xf512
• Description: S12x Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Freescale Semiconductor
PWMRFC
LDFQC
PRSCC
HALFC
Field
7–4
2–1
3
0
LDFQC
0000
0001
0010
0011
0100
0101
0110
0111
Load Frequency C — This field selects the PWM load frequency according to
Section 20.4.7.2, “Load Frequency”
Note: The LDFQC field takes effect when the current load cycle is complete, regardless of the state of the load
Half Cycle Reload C — This bit enables half-cycle reloads in center-aligned PWM mode. This bit has no effect
on edge-aligned PWMs.
0 Half-cycle reloads disabled
1 Half-cycle reloads enabled
Prescaler C — This buffered field selects the PWM clock frequency illustrated in
Note: Reading the PRSCC field reads the buffered value and not necessarily the value currently in effect. The
PWM Reload Flag C — This flag is set at the beginning of every reload cycle regardless of the state of the
LDOKC bit. Clear PWMRFC by reading PMFFQCC with PWMRFC set and then writing a logic one to the
PWMRFC bit. If another reload occurs before the clearing sequence is complete, writing logic one to PWMRFC
has no effect.
0 No new reload cycle since last PWMRFC clearing
1 New reload cycle since last PWMRFC clearing
Note: Clearing PWMRFC satisfies pending PWMRFC CPU interrupt requests.
okay bit, LDOKC. Reading the LDFQC field reads the buffered value and not necessarily the value
currently in effect.
PRSCC field takes effect at the beginning of the next PWM cycle and only when the load okay bit, LDOKC,
is set.
Every 2 PWM opportunities
Every 3 PWM opportunities
Every 4 PWM opportunities
Every 5 PWM opportunities
Every 6 PWM opportunities
Every 7 PWM opportunities
Every 8 PWM opportunities
PWM Reload Frequency
Every PWM opportunity
MC9S12XF - Family Reference Manual, Rev.1.19
Table 20-33. PMFFQCC Field Descriptions
PRSCC
Table 20-34. PWM Reload Frequency C
00
01
10
11
Table 20-35. PWM Prescaler C
for more details.
Chapter 20 Pulse Width Modulator with Fault Protection (PMF15B6C) Module
Description
PWM Clock Frequency
LDFQ[3:0]
1000
1001
1010
1011
1100
1101
1110
1111
f
f
f
bus
bus
bus
f
bus
/2
/4
/8
Every 10 PWM opportunities
Every 11 PWM opportunities
Every 12 PWM opportunities
Every 13 PWM opportunities
Every 14 PWM opportunities
Every 15 PWM opportunities
Every 16 PWM opportunities
Every 9 PWM opportunities
PWM Reload Frequency
Table
Table
20-34. See
20-35.
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