SPMCK16Z4MPV20 datasheet(450/500 Pages) FREESCALE

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M68HC16 Z SERIES

D-76

USER’S MANUAL

F1A/B — Force Logic Level One on PWMA/B

0 = Force logic level zero output on PWMA/B pin.

1 = Force logic level one output on PWMA/B pin.

D.8.15 PWM Registers A/B

PWMA — PWM Register A

$YFF926

PWMB — PWM Register B

$YFF927

The value in these registers determines pulse width of the corresponding PWM output.

A value of $00 corresponds to continuously low output; a value of $80 to 50% duty cy-

cle. Maximum value ($FF) selects an output that is high for 255/256 of the period.

Writes to these registers are buffered by PWMBUFA and PWMBUFB.

D.8.16 PWM Count Register

PWMCNT — PWM Count Register

$YFF928

PWMCNT is the 16-bit free-running counter used for GPT PWM functions.

D.8.17 PWM Buffer Registers A/B

PWMBUFA — PWM Buffer Register A

$YFF92A

PWMBUFB — PWM Buffer Register B

$YFF92B

To prevent glitches when PWM duty cycle is changed, the contents of PWMA and

PWMB are transferred to these read-only registers at the end of each duty cycle. Re-

set state is $0000.

Table D-50 PWM Frequency Ranges

PPR

[2:0]

Prescaler Tap

SFA/B = 0

SFA/B = 1

16.78 MHz

20.97 MHz

25.17 MHz

16.78

MHz

20.97

MHz

25.17

MHz

16.78 MHz

20.97 MHz

25.17 MHz

000

Div 2 = 8.39 MHz

Div 2 = 10.5 MHz

Div 2 = 12.6 MHz

32.8 kHz

41 kHz

49.2 kHz

256 Hz

320 Hz

384 Hz

001

Div 4 = 4.19 MHz

Div 4 = 5.25 MHz

Div 4 = 6.29 MHz

16.4 kHz

20.5 kHz

24.6 kHz

128 Hz

160 Hz

192 Hz

010

Div 8 = 2.10 MHz

Div 8 = 2.62 MHz

Div 8 = 3.15 MHz

8.19 kHz

10.2 kHz

12.3 kHz

64.0 Hz

80.0 Hz

96 Hz

011

Div 16 = 1.05 MHz

Div 16 = 1.31 MHz

Div 16 = 1.57 MHz

4.09 kHz

5.15 kHz

6.13 kHz

32.0 Hz

40.0 Hz

48 Hz

100

Div 32 = 524 kHz

Div 32 = 655 kHz

Div 32 = 787 kHz

2.05 kHz

2.56 kHz

3.07 kHz

16.0 Hz

20.0 Hz

24 Hz

101

Div 64 = 262 kHz

Div 64 = 328 kHz

Div 64 = 393 kHz

1.02 kHz

1.28 kHz

1.54 kHz

8.0 Hz

10.0 Hz

12 Hz

110

Div 128 = 131 kHz

Div 128 = 164 kHz

Div 128 = 197 kHz

512 Hz

641 Hz

770 Hz

4.0 Hz

5.0 Hz

6 Hz

111

PCLK

PCLK/256

PCLK/32768

Freescale Semiconductor, Inc.

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