Datasheet
PCF2129 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 7 — 19 December 2014 12 of 86
NXP Semiconductors
PCF2129
Accurate RTC with integrated quartz crystal for industrial applications
8.2.3 Register Control_3
8.3 Register CLKOUT_ctl
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
00000000
Table 11. Control_3 - control and status register 3 (address 02h) bit description
Bit Symbol Value Description Reference
7 to 5 PWRMNG[2:0] see
Table 1 9
control of the battery switch-over, battery low
detection, and extra power fail detection functions
Section 8.5
4 BTSE 0 no timestamp when battery switch-over occurs Section 8.11.4
1 time-stamped when battery switch-over occurs
3 BF 0 no battery switch-over interrupt generated Section 8.5.1
and
Section 8.11.4
1 flag set when battery switch-over occurs;
flag must be cleared to clear interrupt
2 BLF 0 battery status ok;
no battery low interrupt generated
Section 8.5.2
1 battery status low;
flag cannot be cleared by command
1 BIE 0 no interrupt generated from the battery flag (BF) Section 8.12.6
1 interrupt generated when BF is set
0 BLIE 0 no interrupt generated from battery low flag (BLF) Section 8.12.7
1 interrupt generated when BLF is set
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
value
00X- -000
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