MCP79520-ISLASHMS datasheet(32/58 Pages) MICROCHIP

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MCP7951X/MCP7952X

DS20002300D-page 32

 2012-2022 Microchip Technology Inc.and its subsidiaries

5.6.2

COARSE TRIM MODE

When CRSTRIM = 1, Coarse Trim mode is enabled.

While in this mode, the MCP795XX will apply trimming

every second. If SQWEN is set, the CLKOUT pin will

output a trimmed 1 Hz nominal clock signal.

Because trimming is applied every second rather than

every minute, each step of the TRIMVAL<7:0> value

has a larger effect on the resulting time deviation and

output clock frequency.

By monitoring the CLKOUT output frequency while in

this mode, the user can easily observe the

TRIMVAL<7:0> value affecting the clock timing.

TABLE 5-10:

SUMMARY OF REGISTERS ASSOCIATED WITH DIGITAL TRIMMING

Note 1: The 1 Hz Coarse Trim mode square

wave output is not available while

operating from the backup power supply.

2: With Coarse Trim mode enabled, the

TRIMVAL<7:0> value has a larger effect

on timing. Leaving the mode enabled

during normal operation will likely result

in inaccurate time.

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

on Page

RTCHOUR

TRIMSIGN

12/24

AM/PM

HRTEN1

HRTEN0

HRONE3

HRONE2

HRONE1

HRONE0

CONTROL

—SQWEN

ALM1EN

ALM0EN

EXTOSC

CRSTRIM

SQWFS1

SQWFS0

OSCTRIM

TRIMVAL7 TRIMVAL6 TRIMVAL5 TRIMVAL4

TRIMVAL3

TRIMVAL2 TRIMVAL1 TRIMVAL0

Legend:

— = unimplemented location, read as ‘0’. Shaded cells are not used by digital trimming.l

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