PIC16F753 Datasheet, PDF (37/238 Pages) Microchip Technology – 14/16-Pin, Flash-Based 8-Bit CMOS Microcontrollers

PIC16F753/HV753
4.0 OSCILLATOR MODULE
4.1 Overview
The oscillator module has a variety of clock sources
and selection features that allow it to be used in a wide
range of applications while maximizing performance
and minimizing power consumption. Figure 4-1
illustrates a block diagram of the oscillator module.
The oscillator module can be configured in one of two
clock modes.
1. EC (external clock)
2. INTOSC (internal oscillator)
Clock Source modes are configured by the FOSC bit in
the Configuration Word register (CONFIG).
The internal oscillator module provides the following
selectable system clock modes:
• 8 MHz (HFINTOSC)
• 4 MHz (HFINTOSC Postscaler)
• 1 MHz (HFINTOSC Postscaler)
• 31 kHz (LFINTOSC)
FIGURE 4-1:
PIC^® MCU CLOCK SOURCE BLOCK DIAGRAM
EC Enable
(Figure 4-2)
CLKIN
Internal Oscillator
HFINTOSC Enable
(Figure 4-2)
LFINTOSC Enable
(Figure 4-2)
HFINTOSC
8 MHz
LFINTOSC
31 kHz
Prescaler
÷1
11
÷2
10
÷8
01
00
IRCF<1:0>
EC
1
System Clock
(CPU and
Peripherals)
0
FOSC
COG Clock Source
WDT Clock Source
FIGURE 4-2:
OSCILLATOR ENABLE
FOSC0
Sleep
FOSC0
IRCF<1:0>S_le0_ep0
FOSC0
IRCF<1:0> = 00
Sleep
WDTE
EC Enable
HFINTOSC Enable
LFINTOSC Enable
 2013 Microchip Technology Inc.
Preliminary
DS40001709A-page 37