M41ST95W datasheet(18/35 Pages) STMICROELECTRONICS

Part #	M41ST95W

Description	5.0 or 3.0V, 512 bit (64 bit X 8) Serial RTC (SPI) SRAM and NVRAM Supervisor

PDF	35 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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18 / 35 page

M41ST95Y*, M41ST95W

18/35

To disable the alarm, write '0' to the Alarm Date

is cleared by a READ to the Flags Register as

shown in Figure 14. A subsequent READ of the

Flags Register is necessary to see that the value

of the Alarm Flag has been reset to '0.'

The IRQ/FT/OUT pin can also be activated in the

battery back-up mode. The IRQ/FT/OUT will go

low if an alarm occurs and both ABE (Alarm in Bat-

tery Back-up Mode Enable) and AFE are set.

The ABE and AFE Bits are reset during power-up,

therefore an alarm generated during power-up will

only set AF. The user can read the Flag Register

at system boot-up to determine if an alarm was

generated while the M41ST95Y/W was in the de-

select mode during power-up. Figure 15., page 19

illustrates the back-up mode alarm timing.

Figure 14. Alarm Interrupt Reset Waveform

Table 5. Alarm Repeat Mode

RPT5

RPT4

RPT3

RPT2

RPT1

Alarm Setting

1111

Once per Second

1110

Once per Minute

1100

Once per Hour

1000

Once per Day

0000

Once per Month

0000

Once per Year

AI03664

IRQ/FT/OUT

ACTIVE FLAG

0Fh

0Eh

10h

HIGH-Z

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