Motorola MC68HC908MR32 用户手册
Advance Information
MC68HC908MR16/MC68HC908MR32 — Rev. 4.0
184
Pulse-Width Modulator for Motor Control (PWMMC)
MOTOROLA
Pulse-Width Modulator for Motor Control
Figure 9-46. PWM Clock Cycle and PWM Cycle Definitions
PWM Load Frequency — Frequency at which new PWM parameters
get loaded into the PWM. See
get loaded into the PWM. See
Figure 9-47. PWM Load Cycle/Frequency Definition
PWM CLOCK CYCLE
PWM CYCLE (OR PERIOD)
PWM
PWM CYCLE (OR PERIOD)
Center-Aligned Mode
Edge-Aligned Mode
CLOCK
CYCLE
RELOAD NEW
MODULUS,
PRESCALER, &
PWM VALUES IF
LDOK = 1
MODULUS,
PRESCALER, &
PWM VALUES IF
LDOK = 1
RELOAD NEW
MODULUS,
PRESCALER, &
PWM VALUES IF
LDOK = 1
MODULUS,
PRESCALER, &
PWM VALUES IF
LDOK = 1
PWM LOAD CYCLE
LDFQ1:LDFQ0 = 01 — Reload Every Two Cycles
(1/PWM LOAD FREQUENCY)