M41T93 datasheet(34/49 Pages) STMICROELECTRONICS

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Clock operation

M41T93

34/49

3.15

Initial power-on defaults

Upon initial application of power to the device, the register bits will initially power-on in the

state indicated in Table 13 and Table 14.

Table 13.

Initial power-on default values (part 1)

All other control bits power-up in an undetermined state.

With battery back-up

BMB0-BMB4, RB0, RB1

UC = Unchanged

Table 14.

Initial power-up default values (part 2)

All other control bits power-up in an undetermined state.

With battery back-up

UC = Unchanged

3.16

OTP bit operation

When the OTP (One Time Programmable) Bit is set to a '1,' the value in the internal OTP

registers will be transferred to the analog calibration register (12h) and are “Read only.” The

OTP value is programmed by the manufacturer, and will contain the calibration value

necessary to achieve ±5 ppm at room temperature.

If the OTP Bit is set to '0,' the analog calibration register will become a WRITE/READ

desired value of analog calibration.

When the user sets the OTP Bit, they need to wait for approximately 3 to 4ms before the

analog registers transfer the value from the OTP to the analog registers due to the OTP

Read operation.

Condition(1)

CB1 CB0 OUT

DCS

ACS

Digital

Calib.

Analog

Calib.

OFIE

Watchdog

(3)

A1IE

SQWE ABE

Initial

Power-up

Subsequent

Power-up(2,4)

Condition(1)

RPT11-15

TI/TP

TIE

TD1

TD0 RS0 RS1-3

OTP

RPT21-

AL2E

Initial

Power-up

Subsequent

Power-up(2,3)

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