SEC2410 datasheet(82/283 Pages) MICROCHIP

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SEC2410/SEC4410

DS00001587C-page 82

 2013 - 2014 Microchip Technology Inc.

11.6.2.1

Event Mode Operation

The timer starts counting events when the ENABLE bit in the Timer Control Register is set and continues to count until

the ENABLE bit is cleared. When the ENABLE bit is set, the timer continues counting from the current value in the timer

except after a reset event. After a reset event, the timer always starts counting from the value programmed in the Reload

The RLOAD bit controls the behavior of the timer when it underflows or overflows.

11.6.3

ONE-SHOT MODE

The One-Shot mode of the timer is used to generate a single interrupt to the EC after a specified amount of time. The

timer can be configured to start using the ENABLE bit (Figure 11-7) or on a timer overflow event from the previous timer.

See Section 11.8.2, "Timer x Clock and Event Control Register," on page 87 for configuration details. The ENABLE bit

must be set for an event to start the timer. The ENABLE bit is cleared one clock after the timer starts. The timer always

starts from the value in the Reload Register and counts down in One-Shot mode.

FIGURE 11-6:

EVENT MODE OPERATION

TABLE 11-5:

ONE SHOT MODE OPERATIONAL SUMMARY

Item

Description

Timer Clock Frequencies

This mode supports all the programmable frequencies listed in Table 11-10, “Timer

Clock Frequencies,” on page 88

Filter Clock Frequencies

This mode supports all the programmable frequencies listed in Table 11-10, “Timer

Clock Frequencies,” on page 88

Count Operation

Down Counter

Reload Operation

When the timer underflows the timer will stop.

When the timer is enabled timer starts counting from value programmed in Timer

Reload Register. (RLOAD has no effect in this mode)

Count Start Condition

Setting the ENABLE bit to 1 starts One-Shot mode.

The timer clock automatically clears the enable bit one timer tick later.

Note:

One-Shot mode may be enabled in Event Mode. In Event mode an overflow

from the previous timer is used for timer tick rate.

Count Stop Condition

• Timer is reset (RESET = 1)

• Timer underflows

Interrupt Request

Generation Timing

When an underflow occurs.

TINx Pin Function

One Shot External input

TOUTx Pin Function

The TOUTx pin is asserted when the timer starts and de-asserted when the timer

stops

Read From Timer

Current count value can be read by reading the Timer Count Register

Timer Value

Timer Enable Bit

Event Input

Up/Down Bit

A9FFh

0001h

0000h

A9FFh

AA00h

80C5h

80C3h

AA00h

0000h

AA00h

A9FFh

AA00h

Timer Interrupt

80C4h

AA01h

FFFEh

FFFFh

AA00h

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