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| 型号： | SAF-C868-1RR |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 40 MHz, MICROCONTROLLER, PDSO38 |
| 封装： | PLASTIC, TSSOP-38 |
| 文件页数： | 11/70页 |
| 文件大小： | 1067K |
| 代理商： | SAF-C868-1RR |
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C868
Data Sheet
19
V 0.2, 2002-01
Reset and Brownout
The reset input is an active low input. An internal Schmitt trigger is used at the input for
noise rejection. The RESET pin must be held low for at least tbd usec. But the CPU will
only exit from reset condition after the PLL lock had been detected.
During RESET at transition from low to high, C868 will go into normal mode if ALE/BSL
is high and bootstrap loading mode if ALE/BSL is low. A pullup to VDDP or pulldown to
ground is recommended for pin ALE/BSL. TXD should have a pullup to VDDP and should
not be stimulated externally during reset, as a logic low at this pin will cause the chip to
go into test mode if ALE/BSL is low.
Figure 9 shows the possible reset circuits, note that the RESET pin does not have an
internal pullup resistance.
Figure 9
Reset Circuitries
An on-chip analog circuit detects brownout, if the supply voltage VDDC dips below the
threshold voltage VTHRESHOLD momentarily while RESET pin is high. If this detection is
active for tbd usec then the device will reset. When supply voltage VDDC recovers by
exceeding VTHRESHOLD while RESET is high, the reset is released once PLL is locked
for 4096 clocks. Bit BO in the PMCON0 register is set when brownout detected if
brownout detection was enabled, this bit is cleared by hardware reset RESET and
software. All ports are tristated during brownout.
The VTHRESHOLD has a nominal value of 1.47V, a minimum value of 1.1V and a
maximum value of 1.8V.
RESET
C868
a)
RESET
C868
&
RESET
C868
b)
c)
VDDP
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SAFC8681SG | 制造商:Infineon Technologies AG 功能描述: |
| SAF-C868-1SG-ESAB | 制造商:Infineon Technologies AG 功能描述: |
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| SAF-C868-1SR BA | 功能描述:IC MCU 8BIT ROM/LESS TSSOP-38-1 RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:C5xx/C8xx 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:260 系列:73S12xx 核心处理器:80515 芯体尺寸:8-位 速度:24MHz 连通性:I²C，智能卡，UART/USART，USB 外围设备:LED，POR，WDT 输入/输出数:9 程序存储器容量:64KB（64K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:2K x 8 电压 - 电源 (Vcc/Vdd):2.7 V ~ 5.5 V 数据转换器:- 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:68-VFQFN 裸露焊盘 包装:管件 |
| SAF-C868-1SRBA | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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