参数资料
型号: C8051F018
厂商: Silicon Laboratories Inc
文件页数: 129/154页
文件大小: 0K
描述: IC 8051 MCU 16K FLASH 64TQFP
标准包装: 160
系列: C8051F018
核心处理器: 8051
芯体尺寸: 8-位
速度: 25MHz
连通性: SMBus(2 线/I²C),SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,温度传感器,WDT
输入/输出数: 32
程序存储器容量: 16KB(16K x 8)
程序存储器类型: 闪存
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 2.8 V ~ 3.6 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 64-TQFP
包装: 托盘
C8051F018
C8051F019
11.1.
Power-on Reset
The C8051F018/9 incorporates a power supply monitor that holds the MCU in the reset state until VDD rises above
the VRST level during power-up. (See Figure 11.2 for timing diagram, and refer to Table 11.1 for the Electrical
Characteristics of the power supply monitor circuit.) The /RST pin is asserted (low) until the end of the 100ms
VDD Monitor timeout in order to allow the VDD supply to become stable.
On exit from a power-on reset, the PORSF flag (RSTSRC.1) is set by hardware to logic 1. All of the other reset
flags in the RSTSRC Register are indeterminate. PORSF is cleared by a reset from any other source. Since all
resets cause program execution to begin at the same location (0x0000), software can read the PORSF flag to
determine if a power-up was the cause of reset. The content of internal data memory should be assumed to be
undefined after a power-on reset.
11.2.
Software Forced Reset
Writing a 1 to the PORSF bit forces a Power-On Reset as described in Section 11.1.
Figure 11.2. VDD Monitor Timing Diagram
/RST
t
vol
ts
1.0
2.0
Logic HIGH
Logic LOW
100ms
V
D
2.80
2.40
V
RST
11.3.
Power-fail Reset
When a power-down transition or power irregularity causes VDD to drop below VRST, the power supply monitor
will drive the /RST pin low and return the CIP-51 to the reset state (see Figure 11.2). When VDD returns to a level
above VRST, the CIP-51 will leave the reset state in the same manner as that for the power-on reset. Note that even
though internal data memory contents are not altered by the power-fail reset, it is impossible to determine if VDD
dropped below the level required for data retention. If the PORSF flag is set, the data may no longer be valid.
Rev. 1.2
76
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