TMP86FS28DFG datasheet(99/272 Pages) TOSHIBA

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Page 87

TMP86FS28DFG

8.1.3.2 External Trigger Timer Mode

In the external trigger timer mode, the up-counter starts counting by the input pulse triggering of the

TC10 pin, and counts up at the edge of the internal clock. For the trigger edge used to start counting, either

the rising or falling edge is defined in TC10CR<TC10S>.

• When TC10CR<METT10> is set to “1” (trigger start and stop)

When a match between the up-counter and the TC10DRA value is detected after the timer

starts, the up-counter is cleared and halted and an INTTC10 interrupt request is generated.

If the edge opposite to trigger edge is detected before detecting a match between the up-

counter and the TC10DRA, the up-counter is cleared and halted without generating an interrupt

request. Therefore, this mode can be used to detect exceeding the specified pulse by interrupt.

After being halted, the up-counter restarts counting when the trigger edge is detected.

• When TC10CR<METT10> is set to “0” (trigger start)

When a match between the up-counter and the TC10DRA value is detected after the timer

starts, the up-counter is cleared and halted and an INTTC10 interrupt request is generated.

The edge opposite to the trigger edge has no effect in count up. The trigger edge for the next

counting is ignored if detecting it before detecting a match between the up-counter and the

TC10DRA.

Since the TC10 pin input has the noise rejection, pulses of 4/fc [s] or less are rejected as noise. A pulse

width of 12/fc [s] or more is required to ensure edge detection. The rejection circuit is turned off in the

SLOW1/2 or SLEEP1/2 mode, but a pulse width of one machine cycle or more is required.

Example 1 :Generating an interrupt 1 ms after the rising edge of the input pulse to the TC10 pin

(fc =16 MHz)

LDW

(TC10DRA), 007DH

; 1ms

÷ 27/fc = 7DH

; IMF

= “0”

SET

(EIRL). 7

; Enables INTTC10 interrupt

; IMF

= “1”

(TC10CR), 00000100B

; Selects the source clock and mode

(TC10CR), 00100100B

; Starts TC10 external trigger, METT10

= 0

Example 2 :Generating an interrupt when the low-level pulse with 4 ms or more width is input to the TC10 pin

(fc =16 MHz)

LDW

(TC10DRA), 01F4H

; 4 ms

÷ 27/fc = 1F4H

; IMF

= “0”

SET

(EIRL). 7

; Enables INTTC10 interrupt

; IMF

= “1”

(TC10CR), 00000100B

; Selects the source clock and mode

(TC10CR), 01110100B

; Starts TC10 external trigger, METT10

= 0

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