F21 datasheet(184/416 Pages) MICROCHIP

Part #	F21

Description	16-Bit General Purpose Microcontrollers with 256-Kbyte Flash and 16-Kbyte RAM in Low Pin Count Packages

PDF	416 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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PIC24FJ256GA705 FAMILY

DS30010118D-page 184

 2016-2018 Microchip Technology Inc.

16.1

Time Base Generator

The Timer Clock Generator (TCG) generates a clock

for the module’s internal time base using one of the

clock signals already available on the microcontroller.

This is used as the time reference for the module in its

three major modes. The internal time base is shown in

Figure 16-2.

There are eight inputs available to the clock generator,

which are selected using the CLKSEL<2:0> bits

(CCPxCON1L<10:8>). Available sources include the

FRC and LPRC, the Secondary Oscillator and the TCLKI

external clock inputs. The system clock is the default

source (CLKSEL<2:0> = 000). On PIC24FJ256GA705

family devices, clock sources to the MCCPx module

must be synchronized with the system clock. As a result,

when clock sources are selected, clock input timing

restrictions or module operating restrictions may exist.

FIGURE 16-2:

TIMER CLOCK GENERATOR

CLKSEL<2:0>

TMRPS<1:0>

Prescaler

Clock

Synchronizer

TMRSYNC

Gate(1)

SSDG

Clock

Sources

To Rest

of Module

Note 1:

Gating available in Timer modes only.

F21 Datasheet(PDF) 184 Page - Microchip Technology