FM3316 datasheet(13/28 Pages) RAMTRON

13 / 28 page

FM33256/FM3316 SPI Companion w/ FRAM

Rev. 2.0

Feb. 2009

Page 13 of 28

Address

Description

1Dh

Alarm – Month

10 Month

Month.3

Month.2

Month.1

Month.0

Contains the alarm value for the month and the mask bit to select or deselect the Month value.

Match. Setting this bit to 0 causes the Month value to be used in the alarm match logic. Setting this bit to 1

causes the match circuit to ignore the Month value. Battery-backed, read/write.

1Ch

Alarm – Date

10 date.1

10 date.0

Date.3

Date.2

Date.1

Date.0

Contains the alarm value for the date and the mask bit to select or deselect the Date value.

Match: Setting this bit to 0 causes the Date value to be used in the alarm match logic. Setting this bit to 1 causes

the match circuit to ignore the Date value. Battery-backed, read/write.

1Bh

Alarm – Hours

10 hours.1

10 hours.0

Hours.3

Hours2

Hours.1

Hours.0

Contains the alarm value for the hours and the mask bit to select or deselect the Hours value.

Match: Setting this bit to 0 causes the Hours value to be used in the alarm match logic. Setting this bit to 1 causes

the match circuit to ignore the Hours value. Battery-backed, read/write.

1Ah

Alarm – Minutes

10 min.2

10 min.1

10 min.0

Min.3

Min.2

Min.1

Min.0

Contains the alarm value for the minutes and the mask bit to select or deselect the Minutes value

Match: Setting this bit to 0 causes the Minutes value to be used in the alarm match logic. Setting this bit to 1

causes the match circuit to ignore the Minutes value. Battery-backed, read/write.

19h

Alarm – Seconds

10 sec.2

10 sec.1

10 sec.0

Seconds.3

Seconds.2

Seconds.1

Seconds.0

Contains the alarm value for the seconds and the mask bit to select or deselect the Seconds value.

Match: Setting this bit to 0 causes the Seconds value to be used in the alarm match logic. Setting this bit to 1

causes the match circuit to ignore the Seconds value. Battery-backed, read/write.

18h

Companion Control

SNL

AL/SW

VBC

VTP1

VTP0

SNL

Serial Number Lock: Setting to a ‘1’ makes registers 10h to 17h and SNL read-only. SNL cannot be cleared once

set to ‘1’. Nonvolatile, read/write.

AL/SW

Alarm/Square Wave Select: When set to ‘1’, the alarm match drives the ACS pin as well as the AF flag. When

set to ‘0’, the selected Square Wave Freq will be driven on the ACS pin, and an alarm match only sets the AF

flag. Nonvolatile, read/write.

F(1:0)

Square Wave Freq Select: These bits select the frequency on the ACS pin when the CAL and AL/SW bits are

both ‘0’. Nonvolatile.

Setting

F(1:0)

Setting

F(1:0)

1 Hz

00 (default)

4096 Hz

512 Hz

32768Hz

VBC

VBAK Charger Control: Setting VBC to ‘1’ (and FC=0) causes a 80 µA (1 mA if FC=1) trickle charge current to

be supplied on VBAK. Clearing VBC to ‘0’ disables the charge current. Battery-backed, read/write.

Fast Charge: Setting FC to ‘1’ (and VBC=1) causes a ~1 mA trickle charge current to be supplied on VBAK.

Clearing VBC to ‘0’ disables the charge current. Battery-backed, read/write.

VTP(1:0)

VTP Select. These bits control the reset trip point for the low-VDD reset function. When VDD is below the

selected VTP voltage, the reset pin /RST will drive low and the SPI interface will be locked out. Nonvolatile,

read/write.

FM3316 Datasheet(PDF) 13 Page - Ramtron International Corporation

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