mc68hc908bd48 Freescale Semiconductor, Inc, mc68hc908bd48 Datasheet - Page 150

• Manufacturer Part Number: mc68hc908bd48
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Pulse Width Modulator (PWM)
11.4.1 PWM Data Registers 0 to 15 (0PWM–15PWM)
Data Sheet
150
Address:
The output waveform of the 16 PWM channels are each configured by
an 8-bit register, which contains a 5-bit PWM in MSB portion and a 3-bit
binary rate multiplier (BRM) in LSB portion
xPWM4–xPWM0 — PWM Bits
The value programmed in the 5-bit PWM portion will determine the pulse
length of the output. The clock to the 5-bit PWM portion is the system
clock (CPU clock), the repetition rate of the output is hence f
Examples of PWM output waveforms are shown in
xBRM2–xBRM0 — Binary Rate Multiplier Bits
The 3-bit BRM will generate a number of narrow pulses which are
equally distributed among an 8-PWM-cycle frame. The number of pulses
generated is equal to the number programmed in the 3-bit BRM portion.
Examples of PWM output waveforms are shown in
Reset:
Read:
Write:
Figure 11-1. PWM Data Registers 0 to 15 (0PWM–15PWM)
xPWM4
Bit 7
0
Pulse Width Modulator (PWM)
$0020–$0027 and $0051–$0058
xPWM3
6
0
xPWM2
5
0
xPWM1
4
0
xPWM0
3
0
MC68HC908BD48
xBRM2
Freescale Semiconductor
2
0
Figure
Figure
xBRM1
1
0
11-3.
11-3.
OP
—
÷ 32.
Rev. 2.1
xBRM0
Bit 0
0