MC68331MFC16 datasheet(80/84 Pages) FREESCALE

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MC68331TS/D

FOC[5:1] — Force Output Compare

0 = Has no meaning

1 = Causes pin action programmed for corresponding OC pin, but the OC flag is not set.

FOC[5:1] correspond to OC[5:1].

FPWMA — Force PWMA Value

0 = Normal PWMA operation

1 = The value of F1A is driven out on the PWMA pin, regardless of the state of PPROUT.

FPWMB — Force PWMB Value

0 = Normal PWMB operation

1 = The value of F1B is driven out on the PWMB pin.

PPROUT — PWM Clock Output Enable

0 = Normal PWM operation on PWMA

1 = TCNT clock driven out PWMA pin

PPR[2:0] — PWM Prescaler/PCLK Select

This field selects one of seven prescaler taps, or PCLK, to be PWMCNT input.

SFA — PWMA Slow/Fast Select

0 = PWMA period is 256 PWMCNT increments long.

1 = PWMA period is 32768 PWMCNT increments long.

SFB — PWMB Slow/Fast Select

0 = PWMB period is 256 PWMCNT increments long.

1 = PWMB period is 32768 PWMCNT increments long.

The following table shows the effects of SF settings on PWM frequency for a 16.78-MHz system clock

and a 20.97-MHz system clock.

F1A — Force Logic Level One on PWMA

0 = Force logic level zero output on PWMA pin

1 = Force logic level one output on PWMA pin

PPR[2:0]

System Clock

Divide-By Factor

000

001

010

011

100

101

110

128

111

PCLK

PPR[2:0]

Prescaler Tap

SFA/B = 0

SFA/B = 1

16.78 MHz

20.97 MHz

16.78 MHz

20.97 MHz

16.78 MHz

20.97 MHz

000

Div 2 = 8.39 MHz

Div 2 = 10.5 MHz

32.8 kHz

41 kHz

256 Hz

320 Hz

001

Div 4 = 4.19 MHz

Div 4 = 5.25 MHz

16.4 kHz

20.5 kHz

128 Hz

160 Hz

010

Div 8 = 2.10 MHz

Div 8 = 2.62 MHz

8.19 kHz

10.2 kHz

64.0 Hz

80.0 Hz

011

Div 16 = 1.05 MHz

Div 16 = 1.31 MHz

4.09 kHz

5.15 kHz

32.0 Hz

40.0 Hz

100

Div 32 = 524 kHz

Div 32 = 655 kHz

2.05 kHz

2.56 kHz

16.0 Hz

20.0 Hz

101

Div 64 = 262 kHz

Div 64 = 328 kHz

1.02 kHz

1.28 kHz

8.0 Hz

10.0 Hz

110

Div 128 = 131 kHz

Div 128 = 164 kHz

512 Hz

641 Hz

4.0 Hz

5.0 Hz

111

PCLK

PCLK/256

PCLK/32768

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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