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PCF2123TS bảng dữ liệu(PDF) 26 Page - NXP Semiconductors

tên linh kiện PCF2123TS
Giải thích chi tiết về linh kiện  SPI Real time clock/calendar
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PCF2123TS bảng dữ liệu(HTML) 26 Page - NXP Semiconductors

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PCF2123_2
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02 — 4 December 2009
26 of 55
NXP Semiconductors
PCF2123
SPI Real time clock/calendar
The timing shown for clearing bit TF in Figure 19 is also valid for the non-pulsed interrupt
mode, i.e., when bit TI_TP = 0; INT may be shortened by setting bit TIE to logic 0.
9.9.3 Alarm interrupts
The generation of interrupts from the alarm function is controlled via bit AIE (see Table 6).
If bit AIE is enabled, the INT pin follows the condition of bit AF. Clearing bit AF will
immediately clear INT. No pulse generation is possible for alarm interrupts (see
Figure 20).
9.9.3.1
Correction pulse interrupts
Interrupt pulses generated by correction events can be shortened by writing logic 1 to bit
CIE in register Control_1.
(1) Indicates normal duration of INT pulse (bit TI_TP = 1).
Fig 19. Example of shortening the INT pulse by clearing the TF flag
001aaf909
01
countdown counter
CDTF
INT
SCL
instruction
n
CLEAR INSTRUCTION
8th clock
(1)
Example where only the minute alarm is used and no other interrupts are enabled.
Fig 20. AF timing
001aaf910
44
45
minute counter
minute alarm
AF
INT
SCL
instruction
45
CLEAR INSTRUCTION
8th clock



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