- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄1974 > XE8807AMI026TLF (Semtech)IC MCU LOW PWR MTP FLASH 32-TQFP PDF資料下載
參數(shù)資料
| 型號： | XE8807AMI026TLF |
| 廠商： | Semtech |
| 文件頁數(shù)： | 31/143頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU LOW PWR MTP FLASH 32-TQFP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | XE880x |
| 應(yīng)用： | 感測機(jī) |
| 核心處理器： | Coolrisc816? |
| 程序存儲器類型： | 閃存（11 kB） |
| 控制器系列： | XE8000 |
| RAM 容量： | 512 x 8 |
| 接口： | UART，USRT |
| 輸入/輸出數(shù)： | 24 |
| 電源電壓： | 2.4 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-TQFP |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 供應(yīng)商設(shè)備封裝： | 32-TQFP（7x7） |
| 產(chǎn)品目錄頁面： | 585 (CN2011-ZH PDF) |
| 配用： | XE8000MP-ND - PROG BOARD AND PROSTART2 CARD |
| 其它名稱： | XE8807AMI026DKR |
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頁當(dāng)前第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頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁
Semtech 2006
www.semtech.com
17-5
XE8806A/XE8807A
17.6
General counter registers operation
Counters are enabled by CntAEnable, CntBEnable, CntCEnable, and CntDEnable in RegCntOn.
To stop the counter X, CntXEnable must be reset. To start the counter X, CntXEnable must be set. When
counters are cascaded, CntAEnable and CntCEnable also control respectively the counters B and D.
All counters have a corresponding 8-bit read/write register: RegCntA, RegCntB, RegCntC, and RegCntD. When
read, these registers contain the counter value (or the captured counter value). When written, they modify the
counter comparison values.
It is possible to read any counter at any time, even when the counter is running. The value is guaranteed to be
correct when the counter is running on an internal clock source. For a correct acquisition of the counter value when
running on an external clock source, use one of the three following methods:
1) For slow operating counters (typically at least 8 times slower than the CPU clock), oversample the counter
content and perform a majority operation on the consecutive read results to select the correct actual
content of the counter.
2) Stop the concerned counter, perform the read operation and restart the counter. While stopped, the
counter content is frozen and the counter does not take into account the clock edges delivered on the
external pin.
3) Use the capture mechanism.
When a value is written into the counter register while the counter is in counter mode, both the comparison value is
updated and the counter value is modified. In upcount mode, the register value is reset to zero. In downcount
mode, the comparison value is loaded into the counter. Due to the synchronization mechanism between the
processor clock domain and the external clock source domain, this modification of the counter value can be
postponed until the counter is enabled and that it receives it’s first valid clock edge.
In the PWM mode or in the capture mode, the counter value is not modified by the write operation in the counter
register. Changing to the counter mode, does not update the counter value (no reset in upcount, no load in
downcount mode).
17.7
Clock selection
The clock source for each counter can be individually selected by writing the appropriate value in the register
RegCntCtrlCk.
Table 17-11 gives the correspondence between the binary codes used for the configuration bits CntACkSel(1:0),
CntBCkSel(1:0), CntCCkSel(1:0) or CntDCkSel(1:0) and the clock source selected respectively for the counters
A, B, C or D.
Clock source for
CntXCkSel(1:0)
CounterA
CounterB
CounterC
CounterD
11
Ck128
10
CkRcExt/4
Ck1k
01
CkRcExt
Ck32k
00
PA(0)
PA(1)
PA(2)
PA(3)
Table 17-11: Clock sources for counters A, B, C and D
The CkRcExt clock is the RC oscillator or external clock. The clocks below 32kHz can be derived from the RC
oscillator, the external clock source or the crystal oscillator (see the documentation of the clock block). A separate
external clock source can be delivered on PortA for each individula counter.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XIO2200AGGW | IC PCI-EXPRESS/BUS BRIDGE 176BGA |
| XIO2200AZGW | IC PCI-EXPRESS/BUS BRIDGE 176BGA |
| XPC823ZT81B2T | IC MPU POWERQUICC 81MHZ 256-PBGA |
| XPC8240RZU250E | MCU HOST PROCESSOR 352-TBGA |
| XQ6SLX150T-3CSG484I | IC FPGA SPARTAN-6Q 484-CSBGA |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XE88LC01 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Sensing Machine 16 + 10 bit Data Acquisition Ultra Low-Power Microcontroller |
| XE88LC01MI000 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Sensing Machine 16 + 10 bit Data Acquisition Ultra Low-Power Microcontroller |
| XE88LC01MI027 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Sensing Machine 16 + 10 bit Data Acquisition Ultra Low-Power Microcontroller |
| XE88LC01MI032 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Sensing Machine 16 + 10 bit Data Acquisition Ultra Low-Power Microcontroller |
| XE88LC01RI000 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Sensing Machine 16 + 10 bit Data Acquisition Ultra Low-Power Microcontroller |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。