MC9328MX21VH datasheet(47/106 Pages) MOTOROLA

Part #	MC9328MX21VH

Description	i.MX family of microprocessors

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Manufacturer	MOTOROLA [Motorola, Inc]

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Specifications

MC9328MX21 Product Preview, Rev. 1.1

Freescale Semiconductor

47

3.14

Pulse-Width Modulator

The PWM can be programmed to select one of two clock signals as its source frequency. The selected

clock signal is passed through a divider and a prescaler before being input to the counter. The output is

available at the pulse-width modulator output (PWMO) external pin.

Figure 37. PWM Output Timing Diagram

17

tRC

50

–

18

tCEA

–

45

19

tREA

–

30

20

tRHZ

–

30

21

tCHZ

–

20

22

tOH

15

–

23

tREH

15

–

24

tIR

0

–

25

tWHR

60

–

Table 28. PWM Output Timing Parameter Table

Ref

No.

Parameter

1.8V +/- 0.10V

3.0V +/- 0.30V

Unit

Minimum

Maximum

Minimum

Maximum

1

System CLK frequency1

045045

MHz

2a

Clock high time1

12.29

–

12.29

–

ns

2b

Clock low time1

9.91

–9.91–

ns

3a

Clock fall time1

–0.5–0.5

ns

3b

Clock rise time1

–0.5–0.5

ns

Table 27. Timing Characteristics (Continued)

Number

Timing

Parameter

Minimum

Maximum

System Clock

2a

1

PWM Output

3b

2b

3a

4b

4a

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