V3022 EMMICRO [EM Microelectronic - MARIN SA], V3022 Datasheet - Page 9

• Manufacturer Part Number: V3022
• Description: Very Low Power 8-Bit 32 kHz RTC Module with Digital Trimming and High Level Integration
• Manufacturer: EMMICRO [EM Microelectronic - MARIN SA]

Status Words
Address Command Space
This space contains the three commands used for
carrying out the transfers between the Time and Data
Register and / or the Timer Registers and the reserved
clock and timer area.
Copyright © 2004, EM Microelectronic-Marin SA
R
Table 6
Table 7
Table 8
RAM Map
Note 1 : The MSB (bit 7) of the hours byte (addr. 23 hex
Note 2 : The alarm hours, addr. 33 hex, must always be
Communication
Data transfer is in 8 bit parallel form. All time data is in
packed BCD format with tens data on lines AD7-4 and
units on lines AD3-0. To access information within the
RAM (see Fig.7) first write the RAM address, then read or
write from or to this location. Fig.8 shows the two steps
needed. The lines AD0-7 will be treated as an address
when pin A /D is low, and as data when A /D is high. Pin
write access. One line of the address bus (e.g. A0) can be
used to implement the
Operating Configuration", Fig.1). Until a new address is
written, data accesses (/D high) will always be to the
same RAM address.
A /D must not change state during any single read or
9
Address
Dec
00
01
02
16
Clock
32
33
34
35
36
37
38
39
40
Alarm
48
49
50
51
52
Timer
64
65
66
67
240
241
242
Status
Special purpose
for the clock and 33 hex for the alarm) are used
as AM/PM indicators in the 12 hour time data
format and reading of the hours byte must be
preceded by masking of the AM/PM bit. A set
AM/PM bit indicates PM. In the 24 hour time
data format the bit will always be zero.
rewritten after a change between 12 and 24 hour
modes.
Hex
00
01
02
10
20
21
22
23
24
25
26
27
28
30
31
32
33
34
40
41
42
43
F0
F1
F2
Address Command Space
Parameter
status 0
status 1
status 2
digital trimming
1/100 second
seconds
minutes
hours (note 1)
date
month
year
week day
week number
1/100 second
seconds
minutes
hours (note 1 & 2)
date
1/100 second
seconds
minutes
hours
clock and timer transfer
clock transfer
timer transfer
Data Space
A /D signal (see "Typical
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V3022
Range
0-255
00-99
00-59
00-59
00-23
01-31
01-12
00-99
01-07
00-53
00-99
00-59
00-59
00-23
01-31
00-99
00-59
00-59
00-23
Table 9