Microchip Technology dsPIC33F Family Bedienungsanleitung PDF herunterladen (Seite 3)

Section 11. Timers

Timers

11.2 TIMER VARIANTS

This section describes the different types of timers available on the dsPIC33F/PIC24H family of

devices.

11.2.1 Type A Timer

Timer1 is a Type A timer. A Type A timer has the following unique features over other types of

timers:

• Can be operated from the low-power 32 kHz crystal oscillator available on the device.

• Can be operated in Asynchronous Counter mode from an external clock source.

• Optionally, the external clock input (TxCK) can be synchronized to the internal device clock

and clock synchronization is performed after TxCK is divided by the prescaler. The

advantage of clock synchronization after division by the prescaler is explained in

11.4.3 “Synchronous Counter Mode”.

The unique features of Type A timer allows it to be used for Real-Time Clock (RTC) applications.

Figure 11-1 shows the block diagram of a Type A timer.

Figure 11-1: Type A Timer Block Diagram

Note 1: FCY is the instruction cycle clock.

2: Refer to Section 7. “Oscillator” (DS70186), for information on enabling the secondary oscillator.

TGATE

TCS

TMRx

Comparator

PRx

TGATE

Set TxIF Flag

TSYNC

Sync

Equal

Reset

Prescaler

(/n)

TCKPS<1:0>

Gate

Sync

FCY

(1)

Falling Edge

Detect

Prescaler

(/n)

TCKPS<1:0>

LPOSCEN

(2)

Latch

CLK

DATA

SOSCO/

T1CK

SOSCI

1 2 3 4 5 6 7 8 ... 25 26

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