TMP89FS60 datasheet(210/410 Pages) TOSHIBA

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Page 196

14. 8-bit Timer Counter (TC0)

TMP89FS60

RA002

Figure 14-13 Examples of Inserting Additional Pulses

14.4.7.2 Operations

Setting T001CR<T01RUN> to "1" allows the up counter to increment based on the selected source

clock. When a match between the lower 8 bits of the up counter value and the value set to PWMDUTY is

detected, the output of the PWM1 pin is reversed. When T01MOD<TFF1> is "0", the PWM1 pin changes

from the "L" to "H" level. When T01MOD<TFF1> is "1", the PWM1 pin changes from the "H" to "L"

level.

If any of PWMAD3 to 0 is "1", an additional pulse that corresponds to 1 count of the source clock is

inserted in specific cycles of the duty pulse. In other words, the PWM1 pin output is reversed at the timing

of PWMDUTY+1. When T00MOD<TFF0> is "0", the period of the "L" level becomes longer than the

value set to PWMDUTY by 1 source clock. When T00MOD<TFF0> is "1", the period of the "H" level

becomes longer than the value set to PWMDUTY by 1 source clock. This function allows 16 cycles of

output pulses to be handled with a resolution nearly equivalent to 12 bits.

No additional pulse is inserted when PWMAD3 to 0 are all "0".

Subsequently, the up counter continues counting up. When the up counter value reaches 256, an over-

flow occurs and the up counter is cleared to "0x00". At the same time, the output of the PWM1 pin is

reversed. When T01MOD<TFF1> is "0", the PWM1 pin changes from the "H" to "L" level. When

T01MOD<TFF1> is "1", the PWM1 pin changes from the "L" to "H" level. At this time, an INTT00 inter-

Timer start

Additional

pulse

123456789

PWM1 pin output

(TFF1=“1”)

Timer stop

PWM1 pin output

(TFF1=“0”)

INTT00 interrupt

request

INTT01 interrupt

request

Cycle

When PWMAD1=“1”

Additional

pulse

Timer start

123456789

PWM1 pin output

(TFF1=“1”)

PWM1 pin output

(TFF1=“0”)

INTT00 interrupt

request

INTT01 interrupt

request

Cycle

When PWMAD0 = “1” and PWMAD2 = “1”

Additional

pulse

Additional

pulse

Additional

pulse

Additional

pulse

Additional

pulse

TMP89FS60 Datasheet(PDF) 210 Page - Toshiba Semiconductor

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