M41ST87WMX6F datasheet(40/54 Pages) STMICROELECTRONICS

部件名	M41ST87WMX6F

功能描述	5.0 and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM

PDF	54 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

40 / 54 page

Clock operation

M41ST87W

40/54

DocID9497 Rev 11

3.18

Initial power-on defaults

Table 14: Default values

Condition

OFIE

(1)

Out

AFE

ABE

SQWE

SQWOD

PFOD

Watchdog register

(2)

Initial power-up

Subsequent power-up (with battery backup)

(3)(4)

0 ↑

0 ↓

0 ↓ 0 ↑

0 ↑

0 ↓

Notes:

(1)

When TEBX is set to '1,' the HT bit will not be set on power-down (tamper time-stamp will have precedence).

(2)

WDS, BMB0-BMB4, RB0, RB1.

(3)↑ = VCC rising; ↓ = VCC falling.

(4)

UC = unchanged.

Table 15: Default values

Condition

32kE

THS

TEB1

and 2

TCM1

and 2

TPM1

and 2

TDS1

and 2

TCHI/

��1and

CLR1

and 2

TIE1

and 2

CLRPW0

CLRPW1

CLR1EXT and

CLR2EXT

Initial power-up

(1)

Subsequent power-up

(with battery backup)

(2)

0 ↑

Notes:

(1)

32 kHz output valid only on VCC.

(2)

UC = unchanged.

Note: All other control bits are undetermined.

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