參數(shù)資料
型號: XE8805AMI028LF
廠商: Semtech
文件頁數(shù): 151/156頁
文件大?。?/td> 0K
描述: IC DAS 16BIT FLASH 8K MTP 64LQFP
標(biāo)準(zhǔn)包裝: 160
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(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(yīng)商設(shè)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
16-8
XE8805/05A
16.4.3
Continuous-Time vs. On-Request
The ADC can be operated in two distinct modes: "continuous-time" and "on-request" modes (selected using the bit
CONT
).
In "continuous-time" mode, the input signal is repeatedly converted into digital. After a conversion is finished, a new
one is automatically initiated. The new value is then written in the result register, and the corresponding internal
trigger pulse is generated. This operation is sketched in Figure 16-3. The conversion time in this case is defined as
TCONV.
Internal Trig
Ouput Code
RegACOut[15:0]
T
CONV
BUSY
IRQ
Figure 16-3. ADC "continuous-time" operation
Figure 16-4. ADC "on-request" operation
In the "on-request" mode, the internal behaviour of the converter is the same as in the "continuous-time" mode, but
the conversion is initiated on user request (with the START bit). As shown in Figure 16-4, the conversion time is
also TCONV. Note that the flag is set at the effective start of the conversion. Since the ADC is generally synchronized
on a lower frequency clock than the CPU, there might be a small delay (max. 1 cycle of the ADC sampling
frequency) between the writing of the START or CONT bits and the appearance of BUSY flag.
Internal Trig
Ouput Code
RegACOut[15:0]
T
CONV
Request
START
BUSY
IRQ
Not
Recommended
for
New
Designs
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