MC68HC16Z1CAG16 Datasheet, PDF (450/500 Pages) Freescale Semiconductor, Inc – M68HC16Z Series users manual

Freescale Semiconductor, Inc.
Table D-50 PWM Frequency Ranges
PPR
[2:0]
16.78 MHz
Prescaler Tap
20.97 MHz
25.17 MHz
16.78
MHz
SFA/B = 0
20.97
MHz
25.17
MHz
16.78 MHz
SFA/B = 1
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
PCLK
PCLK/256 PCLK/256 PCLK/256 PCLK/32768 PCLK/32768 PCLK/32768
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
PWMB — PWM Register B
$YFF926
$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
PWMBUFB — PWM Buffer Register B
$YFF92A
$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.
D-76
REGISTER SUMMARY
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M68HC16 Z SERIES
USER’S MANUAL