PCF2127 View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
'PCF2127' PDF : 101 Pages View PDF
NXP Semiconductors
PCF2127
Accurate RTC with integrated quartz crystal for industrial applications
8.2.3 Register Control_3
Table 10. Control_3 - control and status register 3 (address 02h) bit allocation
Bit
7
6
5
4
3
2
1
0
Symbol
PWRMNG[2:0]
BTSE
BF
BLF
BIE
BLIE
Reset
value
0
0
0
0
0
0
0
0
Table 11.
Bit
7 to 5
4
3
2
1
0
Control_3 - control and status register 3 (address 02h) bit description
Symbol
Value
Description
PWRMNG[2:0]
see
Table 25
control of the battery switch-over, battery low
detection, and extra power fail detection functions
BTSE
0
no timestamp when battery switch-over occurs
1
time-stamped when battery switch-over occurs
BF
0
no battery switch-over interrupt generated
1
flag set when battery switch-over occurs;
flag must be cleared to clear interrupt
BLF
0
battery status ok;
no battery low interrupt generated
1
battery status low;
flag cannot be cleared by command
BIE
0
no interrupt generated from the battery flag (BF)
1
interrupt generated when BF is set
BLIE
0
no interrupt generated from battery low flag (BLF)
1
interrupt generated when BLF is set
Reference
Section 8.6
Section 8.12.4
Section 8.6.1
and
Section 8.12.4
Section 8.6.2
Section 8.13.7
Section 8.13.8
8.3 Register CLKOUT_ctl
Table 12. CLKOUT_ctl - CLKOUT control register (address 0Fh) bit allocation
Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as X are undefined at power-on and
unchanged by subsequent resets.
Bit
7
6
5
4
3
2
1
0
Symbol
TCR[1:0]
OTPR
-
-
COF[2:0]
Reset
0
0
X
-
-
0
0
0
value
Table 13. CLKOUT_ctl - CLKOUT control register (address 0Fh) bit description
Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as X are undefined at power-on and
unchanged by subsequent resets.
Bit
Symbol
Value
Description
7 to 6
TCR[1:0]
see Table 14
temperature measurement period
5
OTPR
0
no OTP refresh
1
OTP refresh performed
4 to 3
-
-
unused
2 to 0
COF[2:0]
see Table 15
CLKOUT frequency selection
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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