mc68331cpv20b1 Freescale Semiconductor, Inc, mc68331cpv20b1 Datasheet - Page 220

• Manufacturer Part Number: mc68331cpv20b1
• Description: Mc68331 32 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

D
F1B — Force Logic Level One on PWMB
D.2.15 PWMA/PWMB — PWM Registers A/B
D.2.16 PWMCNT — PWM Count Register
D.2.17 PWMBUFA — PWM Buffer Register A
D.2.18 PRESCL — GPT Prescaler
D-12
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.
PWMCNT is the 16-bit free-running counter used for GPT PWM functions.
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.
The 9-bit prescaler value can be read from bits [8:0] at this address. Bits [15:9] always
read as zeros. Reset state is $0000.
0 = Force logic level zero output on PWMB pin.
1 = Force logic level one output on PWMB pin.
PWMBUFB — PWM Buffer Register B
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REGISTER SUMMARY
$YFF926, $YFF927
USER’S MANUAL
$YFF92A
$YFF92B
$YFF92C
$YFF928
MC68331