pcf2123 NXP Semiconductors, pcf2123 Datasheet - Page 10

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

NXP Semiconductors
PCF2123_1
Product data sheet
9.3.1 Register Control_1
9.3 Control registers
Table 5.
[1]
Bit
7
6
5
4
3
2
1
0
To prevent an accidental software reset, 01011000 (58h) must be sent to register Control_1 (see
Section
Symbol
EXT_TEST
-
STOP
SR
-
12_24
CIE
-
9.5).
Register Control_1 (address 00h) bits description
Rev. 01 — 19 November 2008
Value
0
1
-
0
1
0
1
-
0
1
0
1
-
Description
normal mode
external clock test mode
unused
the RTC source clock runs
the RTC clock is stopped;
no software reset
initiate software reset
unused
24 hour mode is selected
12 hour mode is selected
no correction interrupt generated
interrupt pulses will be generated at every
correction cycle
unused
RTC divider chain flip-flops are
asynchronously set to logic 0;
CLKOUT at 32.768 kHz, 16.384 kHz or
8.192 kHz is still available
this register will always return a 0 when
read
[1]
;
SPI Real time clock/calendar
PCF2123
© NXP B.V. 2008. All rights reserved.
Reference
Section 9.12
-
Section 9.13
Section 9.5
-
-
Section 9.11
-
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