fm3316 Ramtron Corporation, fm3316 Datasheet - Page 13

• Manufacturer Part Number: fm3316
• Description: 3v Integrated Processor Companion With Memory
• Manufacturer: Ramtron Corporation

Register Description
Rev. 1.1
Dec. 2007
Address
1Dh
/M
1Ch
/M
1Bh
/M
1Ah
/M
19h
/M
18h
SNL
AL/SW
F(1:0)
VBC
FC
VTP(1:0)
Description
Alarm – Month
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.
Alarm – Date
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.
Alarm – Hours
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.
Alarm – Minutes
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.
Alarm – Seconds
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.
Companion Control
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.
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.
Square Wave Freq Select: These bits select the frequency on the ACS pin when the CAL and AL/SW bits are
both ‘0’. Nonvolatile.
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 V
Fast Charge: Setting FC to ‘1’ (and VBC=1) causes a ~1 mA trickle charge current to be supplied on V
Clearing VBC to ‘0’ disables the charge current. Battery-backed, read/write.
VTP Select. These bits control the reset trip point for the low-V
selected V
read/write.
SNL
D7
D7
D7
D7
D7
D7
M
M
M
M
M
Setting
TP
5
voltage, the reset pin /RST will drive low and the SPI interface will be locked out. Nonvolatile,
12 Hz
1 Hz
10 min.2
10 sec.2
BAK
AL/SW
D6
D6
D6
D6
D6
D6
0
0
0
. Clearing VBC to ‘0’ disables the charge current. Battery-backed, read/write.
F(1:0)
00 (default)
01
10 hours.1
10 date.1
10 min.1
10 sec.1
D5
D5
D5
D5
D5
0
D5
F1
10 hours.0
10 Month
10 date.0
10 min.0
10 sec.0
D4
D4
D4
D4
D4
D4
F0
Setting
4096 Hz
32768 Hz
Seconds.3
FM33256/FM3316 SPI Companion w/ FRAM
Month.3
Hours.3
Date.3
Min.3
D3
D3
D3
D3
D3
VBC
D3
DD
reset function. When V
F(1:0)
10
11
Seconds.2
Month.2
Hours2
Date.2
Min.2
D2
D2
D2
D2
D2
D2
FC
Seconds.1
Month.1
Hours.1
Date.1
Min.1
DD
D1
D1
D1
D1
D1
VTP1
D1
is below the
Page 13 of 28
Seconds.0
Month.0
Hours.0
BAK
Date.0
Min.0
VTP0
D0
D0
D0
D0
D0
D0
.