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FM3808 Scheda tecnica(PDF) 3 Page - Ramtron International Corporation

Il numero della parte FM3808
Spiegazioni elettronici  256Kb Bytewide FRAM w/ Real-Time Clock
Download  27 Pages
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Produttore elettronici  RAMTRON [Ramtron International Corporation]
Homepage  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM3808 Scheda tecnica(HTML) 3 Page - Ramtron International Corporation

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FM3808
Rev. 1.3 (EOL)
Feb. 2006
Page 3 of 27
Functional Truth Table
/CE
/WE
/OE
Function
H
X
X
Standby/Precharge
!
X
X
Latch Address
L
H
L
Read
L
L
X
Write
Overview
The FM3808 integrates three complementary but
distinct functions under a common interface in a
single package. First, is the 32Kx8 FRAM memory
block (minus 16 bytes), second is the real-time
clock/calendar, and third is the system supervisor.
The functions are integrated to enhance their
individual performance, so that each provides better
capability than three similar stand-alone devices. All
functions
use
the
same
bytewide
address/data
interface and are memory mapped. Special functions,
including the clock/calendar and supervisor system,
are controlled via registers that reside in the top of the
combined
memory
map.
The
register
map
is
described below, followed by a detailed description
of each functional block.
Register Map
The top 16 FRAM address locations control the
clock/calendar, alarm, and supervisor functions. The
registers contain timekeeping data, control bits, or
information flags. A short description of each register
follows. Detailed descriptions of each function follow
the register summary.
Register Map Summary Table
Data
Address
D7
D6D5
D4D3D2D1D0
Function
Range
7FFFh
10 years
years
Years
00-99
7FFEh
0
0
0
10 mo
months
Month
1-12
7FFDh
0
0
10 date
date
Date
1-31
7FFCh
0
0
0
0
0
day
Day
1-7
7FFBh
0
0
10 hours
hours
Hours
0-23
7FFAh
0
10 minutes
minutes
Minutes
0-59
7FF9h
0
10 seconds
seconds
Seconds
0-59
7FF8h
/OSCEN
reserved
reserved
CALS
CAL3
CAL2
CAL1
CAL0
Control-NV
7FF7h
WDS
/WDW
WDT5
WDT4
WDT3
WDT2
WDT1
WDT0
Watchdog
7FF6h
WIE
AIE
PFE
ABE
H/L
P/L
reserved
reserved Interrupts
7FF5h
/Match
0
Alarm 10 date
Alarm date
Alarm Date
1-31
7FF4h
/Match
0
Alarm 10 hours
hours
Alarm Hours
0-23
7FF3h
/Match
Alarm 10 minutes
Alarm minutes
Alarm Minutes
0-59
7FF2h
/Match
Alarm 10 seconds
Alarm seconds
Alarm Seconds
0-59
7FF1h
User-NV
7FF0h
WDF
AF
PF
CF
TST
CAL
W
R
Flags/Control
Note that the shaded register bits are implemented in FRAM, therefore data at these locations is retained even
without backup power.


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