mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 370

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 11 Pulse Width Modulator with Fault Protection (PMF15B6CV2)
11.4.7.3
With a reload opportunity, regardless an actual reload occurs as determined by LDOK bit, the PWMF
reload flag is set. If the PWM reload interrupt enable bit, PWMRIE is set, the PWMF flag generates CPU
interrupt requests allowing software to calculate new PWM parameters in real time. When PWMRIE is
not set, reloads still occur at the selected reload rate without generating CPU interrupt requests.
370
Reload Flag
PWM VALUE = 1
MODULUS = 3
READ PWMRF AS 1 THEN
PWMRF = 1
UP/DOWN
COUNTER
PWM VALUE = 1
LDOK = 1
MODULUS = 2
PWM
Figure 11-68. Full-Cycle Center-Aligned PWM Value Loading
WRITE 0 TO PWMF
Up/Down
COUNTER
PWMRF = 1
Figure 11-69. Full-Cycle Center-Aligned Modulus Loading
PWM Reload
LDOK = 1
PWM
Figure 11-67. PWMRF Reload Interrupt Request
RESET
MC9S12E256 Data Sheet, Rev. 1.08
HALF = 0, LDFQ[3:0] = 00 = Reload every cycle
HALF = 0, LDFQ[3:0] = 00 = Reload every cycle
0
3
2
1
1
3
1
1
Vdd
D
CLK
CLR
Q
1
3
2
1
PWMRIE
PWMRF
1
2
1
1
1
1
1
1
0
3
1
1
CPU Interrupt
Request
0
2
1
1
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