pca2125 NXP Semiconductors, pca2125 Datasheet - Page 12

• Manufacturer Part Number: pca2125
• Description: Spi Real Time Clock / Calendar Semiconductors
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA2125_00
Preliminary data sheet
6.4.1 Data flow
6.5 Alarm function
Table 18.
Figure 7
When one or more of these registers are loaded with a valid minute, hour, day or weekday
and its corresponding bit Alarm Enable not (AEn) is logic 0, then that information will be
compared with the current minute, hour, day and weekday.
Table 19.
Table 20.
Bit
7 to 0
Bit
7
6 to 0
Bit
7
24 hour mode
Fig 7. Data flow for the time function
shows the data flow and data dependencies starting from the 1 Hz clock tick.
Symbol
AEn
minute
alarm
Symbol
AEn
Years (address 08
Minute alarm (address 09
Hour alarm (address 0A
Symbol
years
Value
0
1
00 to 59
Value
0
1
Rev. 00.11 — 30 January 2007
Value
00 to 99
12/24 hour mode
HEX
Description
minute alarm is enabled
minute alarm is disabled
this register holds the minute alarm information coded in BCD
format
Description
hour alarm is enabled
hour alarm is disabled
) bits description
HEX
HEX
) bits description
Description
this register holds the current year coded in BCD format
) bits description
SECONDS
MINUTES
MONTHS
1 Hz tick
HOURS
YEARS
DAYS
WEEK DAY
SPI Real time clock / calendar
001aaf901
PCA2125
© NXP B.V. 2007. All rights reserved.
12 of 40