RV-8523 Datasheet, PDF (12/57 Pages) MICORO CRYSTAL SWITZERLAND – Real Time Clock

Micro Crystal
Real Time Clock / Calendar Module
RV-8523
8.3. TIME AND DATE REGISTERS
Most of these registers are coded in the Binary Coded Decimal (BCD) format. BCD is used to simplify application
use. An example is shown for the array SECONDS.
8.3.1.SECONDS (address 03h…bits description)
Address
03h
Function
Seconds
Bit 7
OS
Bit 6
40
Bit 5
20
Bit 4
10
Bit 3
8
Bit 2
4
Bit 1
2
Bit 0
1
Bit
7
6 to 0
1) _{Startup value.}
Symbol
OS
Seconds
Value
0
1¹⁾
0 to 59
Description
Clock integrity is guaranteed
Clock integrity is not guaranteed
Oscillator has stopped or been interrupted
This register holds the current seconds coded in BCD format
Seconds value is decimal
00
01
02
:
09
10
:
58
59
Upper-digit (ten’s place)
Bit 6
Bit 5
Bit 4
0
0
0
0
0
0
0
0
0
:
:
:
0
0
0
0
0
1
:
:
:
1
0
1
1
0
1
Bit 3
0
0
0
:
1
0
:
1
1
Digit (unit place)
Bit 2
Bit 1
0
0
0
0
0
1
:
:
0
0
0
0
:
:
0
0
0
0
Bit 0
0
1
0
:
1
0
:
0
1
8.3.2.MINUTES (address 04h…bits description)
Address
04h
Function
Minutes
Bit 7
X
Bit 6
40
Bit 5
20
Bit 4
10
Bit 3
8
Bit 2
4
Bit 1
2
Bit
7
6 to 0
Symbol
X
Minutes
Value
-
0 to 59
Description
Unused
This register holds the current minutes coded in BCD format
Bit 0
1
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