Motore di ricerca datesheet componenti elettronici |
|
M41T00SM6E Scheda tecnica(PDF) 11 Page - STMicroelectronics |
|
M41T00SM6E Scheda tecnica(HTML) 11 Page - STMicroelectronics |
11 / 23 page 11/23 M41T00S CLOCK OPERATION The 8-byte Register Map (see Table 2) is used to both set the clock and to read the date and time from the clock, in a binary coded decimal format. Seconds, Minutes, and Hours are contained within the first three registers. Bits D6 and D7 of Clock Register 02h (Century/ Hours Register) contain the CENTURY ENABLE Bit (CEB) and the CENTURY Bit (CB). Setting CEB to a '1' will cause CB to toggle, either from '0' to '1' or from '1' to '0' at the turn of the century (de- pending upon its initial state). If CEB is set to a '0,' CB will not toggle. Bits D0 through D2 of Register 03h contain the Day (day of week). Registers 04h, 05h, and 06h contain the Date (day of month), Month and Years. The eighth clock register is the Calibration Register (this is described in the Clock Calibration section). Bit D7 of Register 00h con- tains the STOP Bit (ST). Setting this bit to a '1' will cause the oscillator to stop. If the device is expect- ed to spend a significant amount of time on the shelf, the oscillator may be stopped to reduce cur- rent drain. When reset to a '0' the oscillator restarts within one second. The seven Clock Registers may be read one byte at a time, or in a sequential block. The Calibration Register (Address location 07h) may be accessed independently. Provision has been made to as- sure that a clock update does not occur while any of the seven clock addresses are being read. If a clock address is being read, an update of the clock registers will be halted. This will prevent a transi- tion of data during the READ. Clock Registers The M41T00S offers 8 internal registers which contain Clock and Calibration data. These regis- ters are memory locations which contain external (user accessible) and internal copies of the data (usually referred to as BiPORT™ TIMEKEEPER cells). The external copies are independent of in- ternal functions except that they are updated peri- odically by the simultaneous transfer of the incremented internal copy. The internal divider (or clock) chain will be reset upon the completion of a WRITE to any clock address. The system-to-user transfer of clock data will be halted whenever the address being read is a clock address (00h to 06h). The update will resume ei- ther due to a Stop Condition or when the pointer increments to any non-clock address (07h). Clock Registers store data in BCD. The Calibra- tion Register stores data in Binary Format. Table 2. TIMEKEEPER® Register Map Keys: 0 = Must be set to '0' CB = Century Bit CEB = Century Enable Bit FT = Frequency Test Bit OF = Oscillator Fail Bit OUT = Output level S = Sign Bit ST = Stop Bit Addr Function/Range BCD Format D7 D6 D5 D4 D3 D2 D1 D0 00h ST 10 Seconds Seconds Seconds 00-59 01h OF 10 Minutes Minutes Minutes 00-59 02h CEB CB 10 Hours Hours (24 Hour Format) Century/ Hours 0-1/00-23 03h 000 00 Day of Week Day 01-7 04h 0 0 10 Date Date: Day of Month Date 01-31 05h 0 0 0 10M Month Month 01-12 06h 10 Years Year Year 00-99 07h OUT FT S Calibration Calibration |
Codice articolo simile - M41T00SM6E |
|
Descrizione simile - M41T00SM6E |
|
|
Link URL |
Privacy Policy |
ALLDATASHEETIT.COM |
Lei ha avuto il aiuto da alldatasheet? [ DONATE ] |
Di alldatasheet | Richest di pubblicita | contatti | Privacy Policy | scambio Link | Ricerca produttore All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |