MCP79520 datasheet(28/58 Pages) MICROCHIP

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MCP7951X/MCP7952X

DS20002300D-page 28

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5.5

MFP Output

The MCP795XX features Square Wave Clock Output

and Alarm Interrupt Output modes through the MFP

pin. If the SQWEN bit is set, then MFP operates in

Square Wave Clock Output mode.

The alarm outputs will remain active on the MFP pin

while operating from the backup power supply. The

Square Wave Clock Output is disabled while operating

from the backup power supply.

FIGURE 5-8:

CLKOUT OUTPUT BLOCK DIAGRAM

5.5.1

SQUARE WAVE OUTPUT MODE

The MCP795XX can be configured to generate a

square wave clock signal on MFP. The input clock

frequency, FOSC, is divided according to the

SQWFS<1:0> bits as shown in Table 5-8.

The square wave output is not available when

operating from the backup power supply, but the

square wave settings can be retained by the backup

power supply so that the square wave output can

continue when VCC is restored.

TABLE 5-8:

CLOCK OUTPUT RATES

Oscillator

EXTOSC

32.768 kHz

8.192 kHz

4.096 kHz

1 Hz

SQWFS<1:0>

Digital

Trim

CRSTRIM

MFP

SQWEN

Alarm Flags

MCP795XX

Note:

All of the clock output rates are affected by

digital trimming except for the 1:1

postscaler value (SQWFS<1:0> = 11).

SQWFS<1:0>

Postscaler

Nominal

Frequency

1:32,768

1 Hz

1:8

4.096 kHz

1:4

8.192 kHz

1:1

32.768 kHz

Note 1: Nominal frequency assumes FOSC is

32.768 kHz.

MCP79520 Datasheet(PDF) 28 Page - Microchip Technology

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