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ST7FLCD1 bảng dữ liệu(PDF) 22 Page - STMicroelectronics

tên linh kiện ST7FLCD1
Giải thích chi tiết về linh kiện  8-bit MCU for LCD Monitors with 60 KBytes Flash,2 KBytes RAM, 2 DDC Ports and Infrared Controller
PDF  95 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST7FLCD1 bảng dữ liệu(HTML) 22 Page - STMicroelectronics

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Reset
ST7FLCD1
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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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