參數(shù)資料
型號: ST7FLCD1
廠商: 意法半導體
英文描述: 8-bit MCU for LCD Monitors with 60 KBytes Flash, 2 KBytes RAM, 2 DDC Ports and Infrared Controller
中文描述: 8位微控制器的液晶顯示器為60千字節(jié)閃存,2千字節(jié)RAM,2個DDC的港口和紅外線控制器
文件頁數(shù): 22/95頁
文件大?。?/td> 633K
代理商: ST7FLCD1
Reset
ST7FLCD1
22/95
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:
V
DD
is above V
TRM
,
V
DD
is below V
TRH
when V
DD
is rising,
V
DD
is below V
TRL
when V
DD
is falling (
Figure 7
)
Note:
Typical hysteresis (
V
TRH
-V
TRL
) of 50 mV.
This circuitry is active only when V
DD
is higher than V
TRM
.
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
V
TRM
V
DD
V
TRH
V
TRL
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ST7FLCD1_05 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-bit MCU for LCD Monitors with 60 KBytes Flash,2 KBytes RAM, 2 DDC Ports and Infrared Controller
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