RV-3049 datasheet(25/65 Pages) MICROCRYSTAL

25 / 65 page

Micro Crystal

DTCXO Temperature Compensated Real Time Clock / Calendar Module

RV-3049

25/65

4.2. RESET

A Reset can be initiated by 3 different ways:

•

Power On Reset (automatically initiated at power-up)

•

Software Reset (can be initiated by software)

•

Self-Recovery System Reset (automatically initiated if enabled by Software and possible deadlock is

detected)

4.2.1.POWER-UP RESET, SYSTEM RESET AND SELF-RECOVERY RESET

Power On Reset:

A Reset is automatically generated at Power On. After Power On Reset has been executed, bit 5 “PON” in Register

Control_Status is set = “1”, it needs to be cleared by writing = “0”.

System Reset:

A Software Reset can be initiated when the System-Reset command “SysR” is set =”1” (bit 4 in Register

Control_Reset). If a System-Reset is executed, the “SR” Flag (bit 4 in Register Control_Status) is set = “1”, needs

to be cleared by writing = “0”.

It is generally recommended to make a System Reset by Software after power-up.

Note:

Please consider the Register Reset Values shown in section 4.2.2. After a Reset has been executed, Self-

Recovery System “SROn” (bit 4 in Register Control_1) is set = “1” and Self-Recovery INT Enable “SRIE” (bit 4 in

Self-Recovery System Reset:

A Self-Recovery System Reset will be automatically initiated when the Self-Recovery function is enabled by bit 4

“SROn” in Register Control_1 is set “1” and internally a possible deadlock-state is detected. If a Self-Recovery

System Reset is executed, the bit 4 “SR” in Register Control_Status is set “1” and need to be cleared by writing “0”.

After a Self-Recovery System Reset is executed and Register Reset Values were written, bit 4 “SRF” in Register

Control_INT Flag is set “1” and needs to be cleared by writing “0”.

In case of a Self Recovery System Reset is executed, an Interrupt is available if Self-Recovery-INT function is

Enabled by bit 4 “SRIE” in Register Control_INT is set “1”.

The purpose of the Self Recovery function is to generate an internal System Reset in case the on-chip state

machine goes into a deadlock. The function is based on an internal counter that is periodically reset by the control

logic. If the counter is not reset on time, a possible deadlock is detected and a System Reset will be triggered. The

System Reset is executed latest after 2 temperature- or voltage-monitoring periods defined in Thermometer Period

bit 0 “ThP” in Register EEPROM Control, i.e. latest after 2 or 32 seconds.

Note:

Please consider the Register Reset Values shown in section 4.2.2. After a Reset has been executed, Self-

Recovery System bit 4 “SROn” in Register Control_1 = “1” and Self-Recovery INT Enable “SRIE” in Register

Control_INT = “0”.

RV-3049 датащи(PDF) 25 Page - MICORO CRYSTAL SWITZERLAND

RV-3049 датащи(HTML) 25 Page - MICORO CRYSTAL SWITZERLAND

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65

датащи скачать

ссылки URL