参数资料
型号: XE8806AMI026TLF
厂商: Semtech
文件页数: 37/143页
文件大小: 0K
描述: IC MCU LOW PWR MTP FLASH 32-TQFP
标准包装: 1
系列: XE880x
应用: 感测机
核心处理器: Coolrisc816?
程序存储器类型: 闪存(22 kB)
控制器系列: XE8000
RAM 容量: 512 x 8
接口: UART,USRT
输入/输出数: 24
电源电压: 2.4 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 32-TQFP
包装: 剪切带 (CT)
供应商设备封装: 32-TQFP(7x7)
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
其它名称: XE8806AMI026CT
Semtech 2006
www.semtech.com
17-10
XE8806A/XE8807A
When the capture function is active, the A and B counters can either upcount or downcount. They do not count
circularly: they restart at zero or at the maximal value (either 0xFF when not cascaded or 0xFFFF when cascaded)
when respectively an overflow or an underflow condition occurs in the counting. The capture function is also active
on the counters when used to generate PWM signals.
CapFunc(1:0) in register RegCntConfig2 determines if the capture function is enabled or not and selects which
edges of the capture signal source are valid for the capture operation. The source of the capture signal can be
selected by setting CapSel(1:0) in the RegCntConfig2 register. For all sources, rising, falling or both edge
sensitivity can be selected. Table 17-15 shows the capture condition as a function of the setting of these
configuration bits.
CapSel(1:0)
Selected capture signal
CapFunc
Selected condition
Capture condition
11
1 K
00
01
10
11
Capture disabled
Rising edge
Falling edge
Both edges
-
1 K rising edge
1 K falling edge
2 K
10
16 K
00
01
10
11
Capture disabled
Rising edge
Falling edge
Both edges
-
16 K rising edge
16 K falling edge
32 K
01
PA3
00
01
10
11
Capture disabled
Rising edge
Falling edge
Both edges
-
PA3 rising edge
PA3 falling edge
PA3 both edges
00
PA2
00
01
10
11
Capture disabled
Rising edge
Falling edge
Both edges
-
PA2 rising edge
PA2 falling edge
PA2 both edges
Table 17-15: Capture condition selection
CapFunc(1:0) and CapSel(1:0) can be modified only when the counters are stopped otherwise data may be
corrupted during one counter clock cycle.
Due to the synchronization mechanism of the shadow registers and depending on the frequency ratio between the
capture and counter clocks, the interrupts may be generated one or only two counter clock pulses after the effective
capture condition occurred. When the counters A and B are not cascaded and do not operate on the same clock,
the interruptions on IrqA and IrqB which inform that the capture condition was met, may appear at different
moments. In this case, the processor should read the shadow register associated to a counter only if
the
interruption related to this counter has been detected.
An edge is detected on the capture signals only if the minimal pulse widths of these signals in the low and high
states are higher than a period of the counter clock source.
17.12 Specifications
Parameter
Min
Typ
Max
Unit
Conditions
500
ns
@ 1.2V
Pulse width in the low and high states for
an external clock source, frequency
division by 2 disabled
125
ns
@ 2.4V
100
ns
@ 1.2V
Pulse width in the low and high states for
an external clock source, frequency
division by 2 enabled
25
ns
@ 2.4V
Pulse width of external capture signals
1
fckcnt
s
Table 17-16: Timing specifications for the counters
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XE8807AMI026TLF 功能描述:IC MCU LOW PWR MTP FLASH 32-TQFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器 - 特定应用 系列:XE880x 产品变化通告:Product Discontinuation 26/Aug/2009 标准包装:250 系列:- 应用:网络处理器 核心处理器:4Kc 程序存储器类型:- 控制器系列:- RAM 容量:16K x 8 接口:以太网,UART,USB 输入/输出数:- 电源电压:1.8V, 3.3V 工作温度:- 安装类型:表面贴装 封装/外壳:208-LQFP 包装:带卷 (TR) 供应商设备封装:PG-LQFP-208 其它名称:SP000314382