PCF2127T 查看數據表（PDF） - NXP Semiconductors.
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PCF2127T Datasheet PDF : 101 Pages
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NXP Semiconductors
PCF2127
Accurate RTC with integrated quartz crystal for industrial applications
8.2 Control registers
The first 3 registers of the PCF2127, with the addresses 00h, 01h, and 02h, are used as
control registers.
8.2.1 Register Control_1
Table 6. Control_1 - control and status register 1 (address 00h) bit allocation
Bits labeled as T must always be written with logic 0.
Bit
7
6
5
4
3
2
1
0
Symbol
EXT_
T
STOP
TSF1
POR_
12_24
MI
SI
TEST
OVRD
Reset
value
0
0
0
0
1
0
0
0
Table 7. Control_1 - control and status register 1 (address 00h) bit description
Bits labeled as T must always be written with logic 0.
Bit
Symbol
Value
Description
Reference
7
EXT_TEST
0
normal mode
Section 8.14
1
external clock test mode
6
T
0
unused
-
5
STOP
0
RTC source clock runs
Section 8.15
1
RTC clock is stopped;
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
4
TSF1
0
no timestamp interrupt generated
Section 8.12.1
1
flag set when TS input is driven to an intermediate
level between power supply and ground;
flag must be cleared to clear interrupt
3
POR_OVRD
0
Power-On Reset Override (PORO) facility disabled; Section 8.8.2
set logic 0 for normal operation
1
Power-On Reset Override (PORO) sequence
reception enabled
2
12_24
0
24-hour mode selected
1
12-hour mode selected
Table 33,
Table 49,
Table 74
1
MI
0
minute interrupt disabled
Section 8.13.1
1
minute interrupt enabled
0
SI
0
second interrupt disabled
1
second interrupt enabled
PCF2127
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 8 — 19 December 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
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