pcf2123 NXP Semiconductors, pcf2123 Datasheet - Page 16

• Manufacturer Part Number: pcf2123
• Description: Spi Real Time Clock/calendar
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCF2123_1
Product data sheet
Table 15.
[1]
Table 16.
Table 17.
[1]
Bit
7 to 5
4 to 0
Month
January
February
March
April
May
June
July
August
September
October
November
December
Bit
7 to 0
Values shown in decimal.
Values shown in decimal.
Symbol
-
MONTHS
Symbol
YEARS
Register Months (address 07h) bits description
Month assignments
Register Years (address 08h) bits description
Upper-digit
Bit 7
X
X
X
X
X
X
X
X
X
X
X
X
Rev. 01 — 19 November 2008
Bit 6
X
X
X
X
X
X
X
X
X
X
X
X
Value
-
01 to 12
Value
00 to 99
Bit 5
X
X
X
X
X
X
X
X
X
X
X
X
[1]
[1]
Description
unused
this register holds the current month coded in BCD
format, see
Description
this register holds the current year coded in BCD format
Bit 4
0
0
0
0
0
0
0
0
0
1
1
1
Table 16
Digit
Bit 3
0
0
0
0
0
0
0
1
1
0
0
0
SPI Real time clock/calendar
Bit 2
0
0
0
1
1
1
1
0
0
0
0
0
PCF2123
© NXP B.V. 2008. All rights reserved.
Bit 1
0
1
1
0
0
1
1
0
0
0
0
1
Bit 0
1
0
1
0
1
0
1
0
1
0
1
0
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