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CHAPTER 7 8-BIT PWM TIMER
Figure 7.6-2 Operations of an 8-bit PWM Timer
Notes:
While interval timer functions are enabled (CNTR: TPE = 1), do not change the count clock cycle
(CNTR: P1, P0).
When 00H is set to the COMR register, the output of the PWM pin is inverted in the cycle of the
count clock.
While interval timer functions are enabled, the output level of the PWM pin in the counter stop state
(CNTR: TPE = 0) is at "L" level.
FFH
(FFH)
(80H)(FFH)
80H
00H(FFH 80H)*
Counter value Comparison value
Timer cycle Change of the COMR value Time
COMR value Clear in the program
TIR bit
TPE bit
OE bit
PWM pin
When the bit to control the output pin (OE) is "0", the pin functions as a
general-purpose I/O port pin (P50).
If the PWM compare register (COMR) value is changed during counter operation, the value
takes effect at the next cycle.
*:
Comparison value