- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄16263 > 73S1217F-EB (Maxim Integrated Products)BOARD EVAL 73S1217F CBL/DOC/CD PDF資料下載
參數(shù)資料
| 型號： | 73S1217F-EB |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 19/93頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL 73S1217F CBL/DOC/CD |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | * |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁當(dāng)前第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁
73S12xxF Software User Guide
UG_12xxF_016
26
Rev. 1.50
4.2.4
Real Time Clock API - Available with the 68-pin 73S12xxF
The 73S12xxF provides a 32-bit counter selectable in 0.5, 1 or 2 second increments to measure time. This time
mark can also be used to generate RTC interrupts at 0.5, 1, 2, 4, or 8-second intervals. A 24-bit trimming
function, along with a 24-bit accumulator, is provided to correct the clock drift induced by the quartz crystal.
The device also supports a watchdog capability. This feature will give the processor 0.5 seconds to
respond to an RTC interrupt. If the RTC interrupt is not serviced within 0.5 seconds, a full RESET to the
72S12xxF is performed. To use the watchdog timer function, the RTC interrupt must be enabled.
Consequently, the watchdog will always be enabled when the RTC interrupt is enabled. It is not possible
to turn off the watchdog while the RTC interrupt is enabled.
Care should be taken as it is possible for the device to be put into an infinite reset loop when an
RTC interrupt is not serviced on time (within 0.5 second). When this problem occurs,
reprogram the Flash with a known good application/program using the TFP.
The RTC block uses the 32768 Hz oscillator signal or divider logic (from the 12 MHz oscillator circuit) to
produce 0.5 second time marks. The 32768 Hz oscillator can be disabled (see the PowerOFF API), but
is intended to operate at all times in all power consumption modes. If a 32 kHz crystal is not provided,
this oscillator must be disabled and the RTC will operate from an internal 96 MHz clock divided by 2930.
In this case, the RTC trim value should be set as described in the following paragraph.
The 3-byte accumulator can hold 2
24 = 16,777,216, which yields a 0.0596 PPM resolution. Using the 12 MHz
oscillator gives 96 MHz/2930 which will generate 32,764 Hz. The core RTC uses a 32,768 Hz Oscillator crystal.
This yields a 106 PPM error. Therefore, the trim value = (106 PPM) / (.0596 PPM) ~= 1778 (0x06F2).
When the accumulator reaches overflow, it will advance the counter one additional count if the trim value
is positive, or prevent the counter from advancing one count if the trim value is negative.
The trim value can be set in the API_12.h file. RTClk_Init () must be called prior to using any of the RTC
APIs. Once the RTC is initialized, the 32 kHz OSC clock will always be running. To turn it off, use the
PowerOFF (DISABLE_RTC) API.
The Real Time Clock API is described in detail below and includes:
RTClk_Init () (page 26)
RTCClk_Control () (page 27)
RTClk_Write () (page 27)
RTCClk_GetTIME () (page 28)
RTCClk_SetTIME () (page 29)
RTClk_Init ()
Purpose
Initialize the Real Time Clock values by setting the accumulator to 0 and setting the
trim values as defined in api_12.h. The default base day is defined as 12:00:00,
01/01/2005 calculated using the Gregorian/Julian conversion defined in:
When this function is called, the RTC is stopped and restarted. The RTC counter,
trim and accumulator will be loaded at the next 32 kHz clock positive edge. The RTC
interrupt is NOT set here. Use RTClk_Control() to set the interrupt. The RTC
counter continues to count whether the RTC interrupt is enabled or not.
The Interrupt service routine for the RTC interrupt can be masked using the Set_Event (eRTC,
pRTCVector) API. If customization of the RTC ISR is desirable, call Set_Event after this API is
called. See Set_Event() for its usage description.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| EBC30DRTS | CONN EDGECARD 60POS DIP .100 SLD |
| UPM2F470MHD | CAP ALUM 47UF 315V 20% RADIAL |
| UPM2D101MHD | CAP ALUM 100UF 200V 20% RADIAL |
| UPA1V182MHD | CAP ALUM 1800UF 35V 20% RADIAL |
| 73S1215F-EB | BOARD EVAL 73S1215F CBL/DOC/CD |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 73S1217F-EB-Lite | 功能描述:開發(fā)板和工具包 - 8051 73S1217F EVB Lite w/Plug & Play/Usb RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評估:C8051F960, Si7005 核心: 接口類型:USB 工作電源電壓: |
| 73S1217F-IMR/F | 制造商:TERIDIAN 制造商全稱:TERIDIAN 功能描述:Bus-Powered 80515 System-on-Chip with USB, ISO 7816 / EMV, PINpad and More |
| 73S13B | 制造商:QUARTZCOM 制造商全稱:QUARTZCOM the communications company 功能描述:-20 ~ +70 °C commercia l application -30 ~ +75 °C on request |
| 73S5040G01X0A | 制造商:NEX Computers 功能描述:INTEL 40GB SSD - Bulk |
| 73S8009C | 制造商:TERIDIAN 制造商全稱:TERIDIAN 功能描述:Versatile Power Management and Smart Card Interface IC |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。