参数资料
型号: C8051F226R
厂商: Silicon Laboratories Inc
文件页数: 140/146页
文件大小: 0K
描述: IC 8051 MCU 8K FLASH 48TQFP
标准包装: 1
系列: C8051F2xx
核心处理器: 8051
芯体尺寸: 8-位
速度: 25MHz
连通性: SPI,UART/USART
外围设备: 欠压检测/复位,POR,WDT
输入/输出数: 32
程序存储器容量: 8KB(8K x 8)
程序存储器类型: 闪存
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 3.6 V
数据转换器: A/D 32x8b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 48-TQFP
包装: 剪切带 (CT)
其它名称: 336-1010-1
C8051F2xx
Rev. 1.6
93
12.4. External Reset
The external RST pin provides a means for external circuitry to force the CIP-51 into a reset state. Assert-
ing an active-low signal on the RST pin will cause the CIP-51 to enter the reset state. Although there is a
weak pull-up, it may be desirable to provide an external pull-up and/or decoupling of the RST pin to avoid
erroneous noise-induced resets. The CIP-51 will remain in reset until at least 12 clock cycles after the
active-low RST signal is removed. The PINRSF flag (RSTSRC.0) is set on exit from an external reset.
The RST pin is 5 V tolerant.
12.5. Missing Clock Detector Reset
The Missing Clock Detector is essentially a one-shot circuit that is triggered by the MCU system clock. If
the system clock goes away for more than 100msec, the one-shot will time out and generate a reset. After
a Missing Clock Detector reset, the MCDRSF flag (RSTSRC.2) will be set, signifying the MSD as the reset
source; otherwise, this bit reads 0. The state of the RST pin is unaffected by this reset. Setting the
MSCLKE bit in the OSCICN register (see SFR Definition 13.1) enables the Missing Clock Detector.
12.6. Comparator 0 Reset
Comparator 0 can be configured as a reset input by writing a 1 to the C0RSEF flag (RSTSRC.5). Compar-
ator 0 should be enabled using CPT0CN.7 (see SFR Definition 8.1) prior to writing to C0RSEF to prevent
any turn-on chatter on the output from generating an unwanted reset. When configured as a reset, if the
non-inverting input voltage (on CP0+) is less than the inverting input voltage (on CP0–), the MCU is put
into the reset state. After a Comparator 0 Reset, the C0RSEF flag (RSTSRC.5) will read 1 signifying Com-
parator 0 as the reset source; otherwise, this bit reads 0. The state of the RST pin is unaffected by this
reset.
12.7. Watchdog Timer Reset
The MCU includes a programmable Watchdog Timer (WDT) running off the system clock. The WDT will
force the MCU into the reset state when the watchdog timer overflows. To prevent the reset, the WDT
must be restarted by application software before the overflow occurs. If the system experiences a soft-
ware/hardware malfunction preventing the software from restarting the WDT, the WDT will overflow and
cause a reset. This should prevent the system from running out of control.
The WDT is automatically enabled and started with the default maximum time interval on exit from all
resets. If desired, the WDT can be disabled by system software or locked 'on' to prevent accidental dis-
abling. Once locked, the WDT cannot be disabled until the next system reset. The state of the RST pin is
unaffected by this reset.
12.7.1. Watchdog Usage
The WDT consists of a 21-bit timer running from the programmed system clock. The timer measures the
period between specific writes to its control register. If this period exceeds the programmed limit, a WDT
reset is generated. The WDT can be enabled and disabled as needed in software, or can be permanently
enabled if desired. Watchdog features are controlled via the Watchdog Timer Control Register (WDTCN)
Enable/Reset WDT
The watchdog timer is both enabled and reset by writing 0xA5 to the WDTCN register. The user's applica-
tion software should include periodic writes of 0xA5 to WDTCN as needed to prevent a watchdog timer
overflow. The WDT is enabled and reset as a result of any system reset.
相关PDF资料
PDF描述
C8051F002R IC 8051 MCU 32K FLASH 32LQFP
PIC18F442-I/P IC MCU FLASH 8KX16 EE A/D 40DIP
PIC32MX340F256H-80I/PT IC PIC MCU FLASH 256K 64-TQFP
PIC16LF874A-I/PT IC PIC MCU FLASH 4KX14 44TQFP
PIC24HJ128GP510-I/PT IC PIC MCU FLASH 128KB 100TQFP
相关代理商/技术参数
参数描述
C8051F226-TB 功能描述:插座和适配器 With C8051F226 MCU RoHS:否 制造商:Silicon Labs 产品:Adapter 用于:EM35x
C8051F23 制造商:未知厂家 制造商全称:未知厂家 功能描述:8K Flash, 256 RAM, 48-Pin MCU
C8051F230 功能描述:8位微控制器 -MCU 8KB RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
C8051F230-GQ 功能描述:8位微控制器 -MCU 8KB 48P MCU RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
C8051F230-GQR 功能描述:8位微控制器 -MCU 8KB 48Pin MCU Tape and Reel RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT