參數(shù)資料
型號(hào): XE8801AMI027LF
廠商: Semtech
文件頁數(shù): 32/135頁
文件大小: 0K
描述: IC DAS 16BIT FLASH 8K MTP 44LQFP
標(biāo)準(zhǔn)包裝: 800
系列: XE880x
應(yīng)用: 感測(cè)機(jī)
核心處理器: Coolrisc816?
程序存儲(chǔ)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: 44-VFQFN 裸露焊盤
包裝: 托盤
供應(yīng)商設(shè)備封裝: 44-MLPQ(7x7)
產(chǎn)品目錄頁面: 585 (CN2011-ZH PDF)
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
Semtech 2005
www.semtech.com
18-9
XE8801A – SX8801R
counters A and B or C and D respectively when they are in cascaded mode. The different possible resolutions in
cascaded mode are shown in Table 18-13. Choosing a 16 bit PWM code higher than the maximum value that can
be represented by the number of bits chosen for the resolution, results in a PWM output which is always tied to 1.
PwmXsize(1:0)
Resolution
11
16 bits
10
14 bits
01
12 bits
00
10 bits
Table 18-13: Resolution selection in cascaded PWM mode
Small PWM code
Large PWM code
Tper
Thlarge
Tllarge
Thsmall
Tlsmall
Figure 18-3: PWM modulation examples
The period of the PWM signal is given by the formula:
ckcnt
resolution
f
Tper
2
=
The duty cycle ratio DCR of the PWM signal is defined as:
Tper
Th
DCR
=
DCR can be selected between 0 % and
100
*
2
1
2
resolution
%.
DCR in % in function of the RegCntX content(s) is given by the relation:
resolution
DCR
2
RegCntX
*
100
=
18.11 Capture function
The 16-bit capture register is provided to facilitate frequency measurements. It provides a safe reading mechanism
for the counters A and B when they are running. When the capture function is active, the processor does not read
anymore the counters A and B directly, but instead reads shadow registers located in the capture block. An
interrupt is generated after a capture condition has been met when the shadow register content is updated. The
capture condition is user defined by selecting either internal capture signal sources derived from the prescaler or
from the external PA(2) or PA(3) ports. Both counters use the same capture condition.
Not
Recommended
for
New
Designs
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