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參數資料
型號: RCM3200
廠商: Electronic Theatre Controls, Inc.
英文描述: C-Programmable Module with Ethernet
中文描述: C編程與以太網模塊
文件頁數: 88/96頁
文件大小: 2066K
代理商: RCM3200
84
RabbitCore RCM3200
F.6 Quadrature Decoder
The two-channel Quadrature Decoder accepts inputs via Parallel Port F from two external
optical incremental encoder modules. Each channel of the Quadrature Decoder accepts an
in-phase (I) and a quadrature-phase (Q) signal, and provides 8-bit counters to track shaft
rotation and provide interrupts when the count goes through the zero count in either direc-
tion. The Quadrature Decoder contains digital filters on the inputs to prevent false counts
and is clocked by the output of Timer A10. Each Quadrature Decoder channel accepts
inputs from either the upper nibble or lower nibble of Parallel Port F. The I signal is input
on an odd-numbered port bit, while the Q signal is input on an even-numbered port bit.
There is also a disable selection, which is guaranteed not to generate a count increment or
decrement on either entering or exiting the disable state. The operation of the counter as a
function of the I and Q inputs is shown below.
Figure F-2. Operation of Quadrature Decoder Counter
The Quadrature Decoders are clocked by the output of Timer A10, giving a maximum
clock rate of one-half of the peripheral clock rate. The time constant of Timer A10 must be
fast enough to sample the inputs properly. Both the I and Q inputs go through a digital fil-
ter that rejects pulses shorter than two clock periods wide. In addition, the clock rate must
be high enough that transitions on the I and Q inputs are sampled in different clock cycles.
The Input Capture (see the
Rabbit 3000 Microprocessor Users Manual
) may be used to
measure the pulse width on the I inputs because they come from the odd-numbered port
bits. The operation of the digital filter is shown below.
3
$/;C'
:$/;C'
!&C'(-
/
Rejected
Accepted
Peri Clock
Timer A10
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相關代理商/技術參數
參數描述
RCM-330-2.0-WT 制造商:Brady Corporation 功能描述:
RCM36DCAD 功能描述:CONN EDGECARD 72POS R/A .156 SLD RoHS:是 類別:連接器,互連式 >> Card Edge 系列:- 標準包裝:1 系列:- 卡類型:非指定 - 雙邊 類型:母頭 Number of Positions/Bay/Row:30 位置數:60 卡厚度:0.062"(1.57mm) 行數:2 間距:0.100"(2.54mm) 特點:- 安裝類型:面板安裝 端子:焊接孔眼 觸點材料:銅鈹 觸點表面涂層:金 觸點涂層厚度:10µin(0.25µm) 觸點類型::全波紋管 顏色:藍 包裝:管件 法蘭特點:側面安裝開口,無螺紋,0.125"(3.18mm)直徑 材料 - 絕緣體:聚對苯二甲酸丁二酯(PBT) 工作溫度:-65°C ~ 125°C 讀數:雙
RCM36DCAD-S189 功能描述:CONN EDGECARD 72POS R/A .156 SLD RoHS:是 類別:連接器,互連式 >> Card Edge 系列:- 標準包裝:1 系列:- 卡類型:非指定 - 雙邊 類型:母頭 Number of Positions/Bay/Row:31 位置數:62 卡厚度:0.062"(1.57mm) 行數:2 間距:0.125"(3.18mm) 特點:- 安裝類型:通孔,直角 端子:焊接 觸點材料:磷青銅 觸點表面涂層:金 觸點涂層厚度:10µin(0.25µm) 觸點類型::發夾式波紋管 顏色:綠 包裝:托盤 法蘭特點:側面安裝開口,無螺紋,0.125"(3.18mm)直徑 材料 - 絕緣體:聚苯硫醚(PPS) 工作溫度:-65°C ~ 125°C 讀數:雙
RCM36DCAH 功能描述:CONN EDGECARD 72POS R/A .156 SLD RoHS:是 類別:連接器,互連式 >> Card Edge 系列:- 標準包裝:1 系列:- 卡類型:非指定 - 雙邊 類型:母頭 Number of Positions/Bay/Row:30 位置數:60 卡厚度:0.062"(1.57mm) 行數:2 間距:0.100"(2.54mm) 特點:- 安裝類型:面板安裝 端子:焊接孔眼 觸點材料:銅鈹 觸點表面涂層:金 觸點涂層厚度:10µin(0.25µm) 觸點類型::全波紋管 顏色:藍 包裝:管件 法蘭特點:側面安裝開口,無螺紋,0.125"(3.18mm)直徑 材料 - 絕緣體:聚對苯二甲酸丁二酯(PBT) 工作溫度:-65°C ~ 125°C 讀數:雙
RCM36DCAH-S189 功能描述:CONN EDGECARD 72POS R/A .156 SLD RoHS:是 類別:連接器,互連式 >> Card Edge 系列:- 標準包裝:1 系列:- 卡類型:非指定 - 雙邊 類型:母頭 Number of Positions/Bay/Row:31 位置數:62 卡厚度:0.062"(1.57mm) 行數:2 間距:0.125"(3.18mm) 特點:- 安裝類型:通孔,直角 端子:焊接 觸點材料:磷青銅 觸點表面涂層:金 觸點涂層厚度:10µin(0.25µm) 觸點類型::發夾式波紋管 顏色:綠 包裝:托盤 法蘭特點:側面安裝開口,無螺紋,0.125"(3.18mm)直徑 材料 - 絕緣體:聚苯硫醚(PPS) 工作溫度:-65°C ~ 125°C 讀數:雙
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