Pwm Operating Range; Pwm Operation In Low-Power System Modes; Pwm Range At 16 Mhz; Pwm Low-Power Mode Operation - Motorola M-CORE MMC2001 Series Reference Manual

15.3 PWM Operating Range

Table 15-3 shows the operating range and resolution of the PWM with a 16-MHz
HI_REFCLK. The minimum period range assumes a value of two in the period regis-
ter, while the maximum assumes a value of 256.

15.4 PWM Operation in Low-Power System Modes

Table 15-4 summarizes PWM operation in the different low-power modes.
Table 15-4 PWM Low-Power Mode Operation
In most modes, the PWM operates as long as a clock is available. In doze mode, the
PWM channels may be selectively disabled, depending on the value of the DOZE
control bit. PWM channel operation will be suspended at the end of the current
period. In stop mode, the PWM halts immediately (due to halting of system clocks)
and forgets the state of any period (the state machine is reset, and the shift register is
cleared). It is assumed that when stop is initiated, the channels have been disabled.
MOTOROLA
15-8
Freescale Semiconductor, Inc.
Table 15-3 PWM Range at 16 MHz
Approximate Period
Divide By
Range at 16 MHz
0.5 µs – 256 µs
4
1 µs – 512 µs
8
2 µs – 1 ms
16
8 µs – 4.1 ms
64
32 µs – 16.5 ms
256
256 µs – 65.6 ms
2048
16384 2 ms – 1 s
65536 8.2 ms – 4 s
Mode
Normal Runs whenever enabled
Wait Runs whenever enabled
If DOZE is set (in PWM control register),
Doze
then disabled.
Stop Disabled
PULSE WIDTH MODULATOR
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Resolution at
16 MHz
.25 µs
.5 µs
1 µs
4 µs
16 µs
128 µs
1 ms
4.1 ms
Operation
MMC2001
REFERENCE MANUAL