TMP89FS60 datasheet(195/410 Pages) TOSHIBA

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Page 181

TMP89FS60

RA002

Figure 14-5 PWM0 Pulse Output

Set the initial state of the PWM0 pin at T00MOD<TFF0>. Setting T00MOD<TFF0> to "0" selects the

"L" level as the initial state of the PWM0 pin. Setting T00MOD<TFF0> to "1" selects the "H" level as the

initial state of the PWM0 pin. If the PWM0 pin is set as the function output pin in the port setting while the

timer is stopped, the value of T00MOD<TFF0> is output to the PWM0 pin. Table 14-6 shows the list of

output levels of the PWM0 pin.

And by setting "1" to T001CR<OUTAND> bit, a logical product (AND) pulse of TC00 and TC01’s out-

put can be output to PWM0 pin. By using this function, the remote-control waveform can be created eaily.

14.4.3.2 Operations

Setting T001CR<T00RUN> to "1" allows the up counter to increment based on the selected source

clock. When a match between the lower 7 bits of the up counter value and the value set to

T00PWM<PWMDUTY> is detected, the output of the PWM0 pin is reversed. When T00MOD<TFF0> is

"0", the PWM0 pin changes from the "L" to "H" level. When T00MOD<TFF0> is "1", the PWM0 pin

changes from the "H" to "L" level.

If T00PWM<PWMAD> is "1", an additional pulse that corresponds to 1 count of the source clock is

added at the 2

× n-th match detection (n=1, 2, 3...). In other words, the PWM0 pin output is reversed at the

timing of T00PWM<PWMDUTY>+1. When T00MOD<TFF0> is "0", the period of the "L" level

becomes longer than the value set to T00<PWMDUTY> by 1 source clock. When T00MOD<TFF0> is

"1", the period of the "H" level becomes longer than the value set to T00PWM<PWMDUTY> by 1 source

clock. This function allows two cycles of output pulses to be handled with a resolution nearly equivalent

to 8 bits.

No additional pulse is inserted when T00PWM<PWMAD> is "0".

Table 14-6 List of Output Levels of PWM0 Pin

TFF0

PWM0

pin output level

Before the start

of operation

(initial state)

T00PWM

matched

(after the addi-

tional pulse)

Overflow

Operation

stopped

(initial state)

T00PWM

Timer start

Additional

pulse

(Duty pulse

width)

128 counts

(cycle width)

128 counts

(cycle width)

Cycle 1

Cycle 2

Cycle 3

Cycle 4

Cycle 5

Cycle 6

PWM0 pin output

(TFF0=“1”)

T00PWM

(Duty pulse

width)

Additional

pulse

Additional

pulse

PWM0 pin output

(TFF0=“0”)

INTT00 interrupt

request

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