RV-3029 Datasheet, PDF (10/67 Pages) MICORO CRYSTAL SWITZERLAND – DTCXO Temperature Compensated Real Time Clock

Micro Crystal
DTCXO Temperature Compensated Real Time Clock / Calendar Module
RV-3029
3. REGISTER ORGANIZATION
The registers are grouped into memory pages. The pages are addressed by the 5 most-significant-bits (MSB’s bits
7 – 3), the 3 least-significant-bites (LSB’s 2 – 0) select the registers within the addressed page.
30 RAM registers organized in 6 memory pages and 6 EEPROM registers organized in 2 memory pages are
available. During interface access, the page address (MSB’s 7 - 3) is fixed while the register address (LSB’s 2 - 0)
are automatically incremented. The content of all counters and registers are frozen to prevent faulty reading of the
clock/calendar registers during carry condition.
The time registers in the Clock and Alarm pages are encoded in the Binary Coded Decimal format (BCD) to simplify
application use. Other registers are either bit-wise or standard binary format.
3.1. REGISTER OVERVIEW
Address
Page
Bit 7 - 3
Address
Hex
Bit 2 - 0
Control page
00000
000
00h
001
01h
010
02h
011
03h
100
04h
Function
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Control_1
Clk/Int TD1
TD0 SROn EERE TAR
TE
Control_INT
X
X
X
SRIE V2IE V1IE
TIE
Control_INT Flag X
X
X
SRF V2IF V1IF
TF
Control_Status EEbusy X
PON
SR
V2F
V1F
X
Control_Reset
X
X
X
SysR
X
X
X
Bit 0
WE
AIE
AF
X
X
Clock page
000
001
010
011
00001
100
101
110
Alarm page
000
001
010
011
00010
100
101
110
Timer page
000
00011
001
Temperature page
00100
000
EEPROM User
000
00101
001
EEPROM Control page
000
001
00110
010
011
RAM page
000
:
00111
111
08h Seconds
09h Minutes
0Ah Hours
0Bh Days
0Ch Weekdays
0Dh Months
0Eh Years
X
40
20
10
8
4
2
1
X
40
20
10
8
4
2
1
X
12-24 20-PM 10
8
4
2
1
X
X
20
10
8
4
2
1
X
X
X
X
X
4
2
1
X
X
X
10
8
4
2
1
X
40
20
10
8
4
2
1
10h Second Alarm
AE_S
40
20
10
8
4
2
1
11h Minute Alarm
AE_M
40
20
10
8
4
2
1
12h Hour Alarm
AE_H
X 20-PM
10
8
4
2
1
13h Days Alarm
AE_D
X
20
10
8
4
2
1
14h Weekday Alarm AE_W X
X
X
X
4
2
1
15h Months Alarm
AE_M
X
X
10
8
4
2
1
16h Year Alarm
AE_Y
40
20
10
8
4
2
1
18h Timer Low
19h Timer High
128
64
32
16
8
4
2
1
128
64
32
16
8
4
2
1
20h Temperature
128
64
32
16
8
4
2
1
28h EEPROM User
29h EEPROM User
2 bytes of EEPROM for user data
30h EEPROM Contr. R80k R20k R5k
R1k
FD1
FD0
ThE
ThP
31h Xtal Offset
sign
64
32
16
8
4
2
1
32h Xtal Coef
128
64
32
16
8
4
2
1
33h Xtal T0
X
X
32
16
8
4
2
1
38h
:
User RAM
3Fh
8 bytes of RAM for user data
Bit positions labelled as “X” are not implemented and will return a “0” when read.
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