M32CSLASH8A datasheet(360/372 Pages) RENESAS

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M32C/8A Group

24. Usage Notes

Rev.1.00

Jul 15, 2007

Page 343 of 352

REJ09B0385-0100

24.7.2.3

Timer A (One-Shot Timer Mode)

• The TAiS bit (i = 0 to 4) in the TABSR register is set to 0 (count stops) after reset. Set the TAiS bit to 1

(count starts) after selecting timer operating mode and setting the TAi register.

• The following occurs when the TAiS bit in the TABSR register is set to 0 (count stops) while counting.

• The counter stops counting and the contents of the reload register is reloaded.

• The TAiOUT pin outputs a low-level (“L”) signal.

• The IR bit in the TAiIC register becomes 1 (interrupt requested) after one CPU clock cycle.

• One-shot timer is operated by an internal count source. When an external trigger is selected, a maximum of

one count source clock delay occurs between the trigger input to the TAiIN pin and the one-shot timer

output.

• The IR bit becomes 1 when one of the following procedures are used to set timer operating mode.

• When selecting one-shot timer mode after reset.

• When switching from timer mode to one-shot timer mode.

• When switching from event counter mode to one-shot timer mode.

To use the timer Ai interrupt (IR bit), set the IR bit to 0 after one of the above setting has done.

• When a retrigger occurs while counting, the contents of the reload register is reloaded after the counter

decrements by one, and continues counting.

To generate a retrigger while counting, wait 1 count source clock cycle or more after the last trigger.

• When an external trigger input is selected to start counting in timer A one-shot timer mode, do not provide

an external retrigger input for 300 ns before a timer A counter value reaches 0000h. One-shot timer may

stop counting.

(Technical update: TN-16C-125A/EA)

24.7.2.4

Timer A (Pulse Width Modulation Mode)

• The TAiS bit (i = 0 to 4) in the TABSR register is set to 0 (count stops) after reset. Set the TAiS bit to 1

(count starts) after selecting timer operating mode and setting the TAi register.

• The IR bit becomes 1 when one of the following procedures are used to select timer operating mode.

• When selecting PWM mode after reset.

• When switching from timer mode to PWM mode.

• When switching from event counter mode to PWM mode.

To use the timer Ai interrupt (IR bit), set the IR bit to 0 after one of the above setting has done.

• The following occurs when the TAiS bit is set to 0 (count stops) while PWM pulse is output.

• The counter stops.

• If the TAiOUT pin outputs a high-level (“H”) signal, the signal changes to “L” and the IR bit

becomes 1.

• If the TAiOUT pin outputs an “L” signal, its output signal and the IR bit remains unchanged.

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