mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 220

• Manufacturer Part Number: mc68hc908sr12
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Pulse Width Modulator (PWM)
13.10.4 PWM Phase Control Register
Data Sheet
220
Address:
The value of each PWM data register is continuously compared with the
content of a PWM counter to determine the state of each PWM channel
output pin.
A value of $00 loaded into these register results in a continuously low
output on the corresponding PWM output pin. A value of $80 results in a
50% duty cycle output and so on. The maximum value, $FF correspond
to an output which is a "1" for 255/256 of the PWM cycle.
A new value written to the PWM data register will not be effective until
the end of the current PWM period. Upon the end of the current PWM
period, the contain of the PWM data register is loaded into the PWM data
buffer, the value of the PWM data buffer controls the PWM output.
The PWM phase control register (PWMPCR) enables the automatic
phase control and sets the phase values between the PWM channels.
PHEN — PWM Automatic Phase Control Enable Bit
PHD6–PHD0 — PWM Phase Value Bits
Reset:
Read:
Write:
Setting this bit to 1 will enable the automatic phase control function.
Reset clears this bit.
This 7-bit phase value is used to determined the start-up time of the
different PWM counters when PHEN bit is set. Reset clears these bits.
1 = Automatic phase control enabled
0 = Automatic phase control disabled
Figure 13-10. PWM Phase Control Register (PWMPCR)
$0056
PHEN
0
Pulse Width Modulator (PWM)
PHD6
0
PHD5
0
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
PHD4
0
PHD3
0
PHD2
Freescale Semiconductor
0
PHD1
0
PHD0
0