參數(shù)資料
型號: XE8801AMI000WP
廠商: Semtech
文件頁數(shù): 119/135頁
文件大?。?/td> 0K
描述: SENSING MACHINE WITH 16 + 10 BIT
標準包裝: 558
系列: XE880x
應(yīng)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: 模具
包裝: 托盤
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
其它名稱: Q2722595
Semtech 2005
www.semtech.com
15-5
XE8801A – SX8801R
15.8 Function description
The bit UsrtEnable in RegUsrtCtrl is used to enable the USRT interface and controls the PB[4] and PB[5] pins.
This bit puts these two port B lines in the open drain configuration requested to use the USRT interface.
If no external pull-ups are added on PB[4] and PB[5], the user can activate internal pull-ups by setting PBPullup[4]
and PBPullup[5] in RegPBPullup.
The bits UsrtEnWaitS0, UsrtEnWaitCond1, UsrtWaitS0 in RegUsrtCtrl are used for transmitter/receiver control
of USRT interface.
Figure 15-3 shows the unconditional clock stretching function which is enabled by setting UsrtEnWaitS0.
S0
UsrtWaitS0
write Reg UsrtBufferS1
Figure 15-3: S0 Stretching (UsrtEnWaitS0=1)
When UsrtEnWaitS0 is 1, the S0 line will be maintained at 0 after its falling edge (clock stretching). UsrtWaitS0 is
then set to 1, indicating that the S0 line is forced low. One can release S0 by writing to the RegUsrtBufferS1
register.
The same can be done in combination with condition 1 detection by setting the UsrtEnWaitCond1 bit. Figure 15-4
shows the conditional clock stretching function which is enabled by setting UsrtEnWaitCond1.
S0
UsrtWaitS0
write Reg UsrtBufferS1
S1
Figure 15-4: Conditional stretching (UsrtEnWaitCond1=1)
Not
Recommended
for
New
Designs
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