PIC16F15213 datasheet(79/439 Pages) MICROCHIP

79 / 439 page

• Program the FEXTOSC Configuration bits to select the appropriate External Clock (EC) mode:

– ECH mode for oscillators operating at or above 16 MHz (FEXTOSC = 11)

– ECL mode for oscillator operating below 16 MHz (FEXTOSC = 01)

11.2.1.1 EC Mode

The External Clock (EC) mode allows an externally generated logic level signal to be the system clock source. When

operating in EC mode, an external clock source is connected to the CLKIN input pin. The CLKOUT pin is available as

a general purpose I/O pin or as the CLKOUT signal pin.

EC mode provides two Power mode selections:

• ECH: High Power mode

• ECL: Low Power mode

When EC mode is selected, there is no delay in operation after a Power-on Reset (POR) or wake-up from Sleep.

Because the PIC

® MCU design is fully static, stopping the external clock input will have the effect of halting the device

while leaving all data intact. Upon restarting the external clock, the device will resume operation as if no time had

elapsed.

Figure 11-2 shows the pin connections for EC mode.

Figure 11-2. External Clock (EC) Mode Operation

Filename:

External Clock (EC) Mode Operation.vsdx

Title:

Last Edit:

1/8/2020

First Used:

Notes:

Rev. Ex ternal C

1/8/2020

PIC

® MCU

CLKIN

CLKOUT

External Clock

Source

CLKOUT (FOSC / 4)

or I/O

(1)

Note:

Output depends on the setting of the CLKOUTEN Configuration bit.

11.2.2

Internal Clock Sources

The internal oscillator block contains two independent oscillators that can produce two internal system clock sources:

• High-Frequency Internal Oscillator (HFINTOSC)

• Low-Frequency Internal Oscillator (LFINTOSC)

An internal oscillator source can be used as the device system clock by programming the RSTOSC Configuration bits

to select one of the INTOSC sources.

In INTOSC mode, the CLKIN and CLKOUT pins are available for use as general purpose I/Os, provided that no

external oscillator is connected. The function of the CLKOUT pin is determined by the CLKOUTEN Configuration bit.

When CLKOUTEN is set (CLKOUTEN = 1), the pin functions as a general purpose I/O. When CLKOUTEN is clear

(CLKOUTEN = 0), the system instruction clock (FOSC/4) is available as an output signal on the pin.

11.2.2.1 HFINTOSC

The High-Frequency Internal Oscillator (HFINTOSC) is a factory-calibrated, precision digitally-controlled internal

clock source that produces a wide range of stable clock frequencies. The HFINTOSC can be enabled by

programming the RSTOSC Configuration bits to select the one of two HFINTOSC options upon device Reset or

power-up.

The HFINTOSC frequency is selected via the HFINTOSC Frequency Selection (FRQ) bits. Fine-tuning of the

HFINTOSC is done via the HFINTOSC Frequency Tuning (TUN) bits.

PIC16F15213/14/23/24/43/44

OSC - Oscillator Module

and its subsidiaries

Data Sheet

DS40002195E-page 79

PIC16F15213 データシート(PDF) 79 Page - Microchip Technology

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