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S3C2440A RISC MICROPROCESSOR PWM TIMER
10-7
PULSE WIDTH MODULATION (PWM)
Write
TCMPBn = 60
Write
TCMPBn = 50
Write
TCMPBn = 40
Write
TCMPBn = 30
Write
TCMPBn = 30
Write
TCMPBn = Next PWM Value
60
50 40 30 30
Figure 10-5. Example of PWM
PWM function can be implemented by using the TCMPBn. PWM frequency is determined by TCNTBn. Figure 10-5
shows a PWM value determined by TCMPBn.
For a higher PWM value, decrease the TCMPBn value. For a lower PWM value, increase the TCMPBn value. If an
output inverter is enabled, the increment/decrement may be reversed.
The double buffering function allows the TCMPBn, for the next PWM cycle, written at any point in the current PWM
cycle by ISR or other routine.