TC35679FSG-002

2018-01-17

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4.6.2.

Rhythm Function (Output Masking)

Figure 4-19 shows the brief explanation of PWM rhythm function. In addition to the one for pulse generation, TC35679 has another

timer that has 50 ms × 20 = 1 s (rhythm counter). That timer has 20 bits register (pattern register), each bit corresponds to the rhythm

counter that counts down in every 50 ms. When the pattern register is zero, the PWM output is masked to zero or one. Using this

function, LED or buzzer can be on with 1 s periodical pattern.

1

0

1

50ms

Cycle time

1

0

1

1

0

1

0

1

19

18

17

16

15

1

0

19

Rhythm Counter

Pattern Register

PWM Output

50ms

1s (50ms*20)

Interrupt

PWM Generate

Note

If the rhythm pattern set period (50ms) ÷ pulse cycle time = not an integral,

at the pattern register boundary (0 to 1, 1 to 0), duty cycle of the pulse will

not be as setting. Duty ratio of the pulse will not be as set.

Pattern Register

PWM Output

PWM Generate

Figure 4-19 PWM Rhythm Function

1 s (50 ms × 20)