参数资料
型号: ST7FLCD1G9M1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDSO28
封装: ROHS COMPLIANT, SO-28
文件页数: 15/96页
文件大小: 846K
代理商: ST7FLCD1G9M1
Reset
ST7FLCD1
3
Reset
The Reset procedure provides an orderly software start-up or is used to exit Low Power modes.
Three reset modes are provided:
1. Low Voltage Detector reset,
2. Watchdog or Illegal Opcode Access reset,
3. External Reset using the RESET pin.
At reset, the reset vector is fetched from addresses FFFEh and FFFFh and loaded into the PC (the
program is executed starting at this point).
Internal circuitry provides a 4096 CPU clock cycle delay as soon as the oscillator becomes active.
3.1
Low Voltage Detector and Watchdog Reset
The Low Voltage Detector generates a reset when:
VDD is above VTRM,
VDD is below VTRH when VDD is rising,
VDD is below VTRL when VDD is falling (Figure 7)
Note:
Typical hysteresis (VTRH-VTRL) of 50 mV.
This circuitry is active only when VDD is higher than VTRM.
During the Low Voltage Detector reset, the RESET pin is held low, permitting the MCU to reset
other devices.
During a Watchdog reset, the RESET pin is pulled low permitting the MCU to reset other devices as
during a Low Voltage reset (Figure 8). The reset cycle is pulled low for 500 ns (typical).
Figure 7: Low Voltage Detector
RESET
VTRM
VDD
VTRH
VTRL
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