PCF2129AT/2,518 NXP Semiconductors, PCF2129AT/2,518 Datasheet - Page 8

• Manufacturer Part Number: PCF2129AT/2,518
• Description: Real Time Clock
• Manufacturer: NXP Semiconductors
• Series: PCF2129r

Specifications of PCF2129AT/2,518

• Rohs: yes
• Function: Clock, Calendar, Alarm, Watchdog, Timestamp
• Rtc Bus Interface: I2C, SPI
• Date Format: Binary
• Time Format: Binary
• Supply Voltage - Max: 4.2 V
• Supply Voltage - Min: 1.2 V
• Maximum Operating Temperature: + 60 C
• Minimum Operating Temperature: - 15 C
• Mounting Style: SMD/SMT
• Package / Case: SOP-20
• Battery Backup Switching: Yes
• Factory Pack Quantity: 2000

NXP Semiconductors
PCF2129AT
Product data sheet
8.2.1 Register Control_1
8.2 Control registers
The first 3 registers of the PCF2129AT, with the addresses 00h, 01h, and 02h, are used
as control registers.
Table 6.
[1]
[2]
Bit
7
6
5
4
3
2
1
0
Default value.
When writing to the register this bit always has to be set logic 0.
Symbol
EXT_TEST
T
STOP
TSF1
POR_OVRD
12_24
MI
SI
Control_1 - control and status register 1 (address 00h) bit description
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 12 February 2013
Value
0
1
0
0
1
0
1
0
1
0
1
0
1
0
1
[1]
[2]
[1]
[1]
[1]
[1]
[1]
[1]
Description
normal mode
external clock test mode
unused
RTC source clock runs
RTC clock is stopped;
no timestamp interrupt generated
flag set when TS input is driven to an
intermediate level between power supply and
ground;
Power-On Reset Override (PORO) facility
disabled;
PORO enabled
24 hour mode selected
12 hour mode selected
minute interrupt disabled
minute interrupt enabled
second interrupt disabled
second interrupt enabled
RTC divider chain flip-flops are
asynchronously set logic 0;
CLKOUT at 32.768 kHz, 16.384 kHz, or
8.192 kHz is still available
flag must be cleared to clear interrupt
set logic 0 for normal operation
Integrated RTC, TCXO and quartz crystal
PCF2129AT
© NXP B.V. 2013. All rights reserved.
Reference
Section 8.13
-
Section 8.14
Section 8.11.1
Section 8.7.2
Table 19
Section 8.12.1
8 of 73