參數(shù)資料
型號: XE8805AMI028LF
廠商: Semtech
文件頁數(shù): 51/156頁
文件大?。?/td> 0K
描述: IC DAS 16BIT FLASH 8K MTP 64LQFP
標準包裝: 160
系列: XE880x
應用: 感測機
核心處理器: Coolrisc816?
程序存儲器類型: 閃存(22 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: 64-LQFP
包裝: 托盤
供應商設備封裝: 64-LQFP(10x10)
產(chǎn)品目錄頁面: 585 (CN2011-ZH PDF)
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
Semtech 2006
www.semtech.com
20-4
XE8805/05A
20.5
Block schematic
PB(0)
Capture
ck32k
ck1k
PA(0)
RegCntA (write)
Counter A
PA(2)
RegCntC (write)
Counter C
RegCntD (write)
Counter D
RegCntB (write)
Counter B
PA(1)
PA(3)
ck128
ckrcext/4
ckrcext
ck1k
ck32k
PWM
PB(1)
RegCntA (read)
RegCntB (read)
RegCntC (read)
RegCntD (read)
Figure 20-1: Counters/timers block schematic
20.6
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.
In the control registers, all registers must be written in this order: RegCntCtrlCk, RegCntConfig1, RegCntConfig2
and all RegCntX because several bits have no default values at reset.
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.
For a correct acquisition of the counter value, use one of the three following methods:
1) 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.
Not
Recommended
for
New
Designs
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