aduc7062 Analog Devices, Inc., aduc7062 Datasheet - Page 69

• Manufacturer Part Number: aduc7062
• Description: Low-power, Precision Analog Microcontroller, Dual ?-? Adcs, Flash/ee, Arm7tdmi
• Manufacturer: Analog Devices, Inc.

Preliminary Technical Data
PULSE-WIDTH MODULATOR (PWM)
PWM GENERAL OVERVIEW
The ADuC706x integrates a six channel PWM interface. The
PWM outputs can be configured to drive an H-bridge or can be
used as standard PWM outputs. On power up, the PWM
outputs default to H-bridge mode. This ensures that the motor
is turned off by default. In standard PWM mode, the outputs
are arranged as three pairs of PWM pins. Users have control
over the period of each pair of outputs and over the duty cycle
of each individual output.
Table 78. PWM MMRs
Name
PWMCON
PWM0COM0
PWM0COM1
PWM0COM2
PWM0LEN
PWM1COM0
PWM1COM1
PWM1COM2
PWM1LEN
PWM2COM0
PWM2COM1
PWM2COM2
PWM2LEN
PWMICLR
Description
PWM Control.
Compare Register 0 for PWM Output 0 and
Output 1.
Compare Register 1 for PWM Output 0 and
PWM Output 1.
Compare Register 2 for PWM Output 0 and
PWM Output 1
Frequency control for PWM Output 0 and PWM
Output 1.
Compare Register 0 for PWM Output 2 and
PWM Output 3.
Compare Register 1 for PWM Output 2 and
PWM Output 3.
Compare Register 2 for PWM Output 2 and
PWM Output 3.
Frequency Control for PWM Output 2 and PWM
Output 3.
Compare Register 0 for PWM Output 4 and
PWM Output 5.
Compare Register 1 for PWM Output 4 and
PWM Output 5.
Compare Register 2 for PWM Outputs 4 and
PWM Output 5.
Frequency Control for PWM Output 4 and PWM
Output 5.
PWM interrupt clear.
Rev. PrA | Page 69 of 100
In all modes, the PWMxCOMx MMRs controls the point at
which the PWM outputs change state. An example of the first
pair of PWM outputs (PWM0 and PWM1) is shown in Figure 21.
The PWM clock is selectable via PWMCON with one of the
following values: UCLK divided by 2, 4, 8, 16, 32, 64, 128, or
256. The length of a PWM period is defined by PWMxLEN.
The PWM waveforms are set by the count value of the 16-bit
timer and the compare registers contents as shown with the
PWM0 and PWM1 waveforms in (Figure TBD).
The low-side waveform, PWM1, goes high when the timer
count reaches PWM0LEN, and it goes low when the timer
count reaches the value held in PWM0COM2 or when the
high-side waveform PWM0 goes low.
The high-side waveform, PWM0, goes high when the timer
count reaches the value held in PWM0COM0, and it goes low
when the timer count reaches the value held in PWM0COM1.
HIGH SIDE
LOW SIDE
(PWM0)
(PWM1)
PWM0COM2
PWM0COM1
PWM0COM0
PWMLEN0
ADuC7060/ADuC7061/ADuC7062
Figure 21. PWM Timing