参数资料
型号: ST7FLITE10BY0B6
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP16
封装: 0.300 INCH, ROHS COMPLIANT, PLASTIC, DIP-16
文件页数: 84/159页
文件大小: 2855K
代理商: ST7FLITE10BY0B6
ST7LITE1xB
30/159
RESET SEQUENCE MANAGER (Cont’d)
The RESET pin is an asynchronous signal which
plays a major role in EMS performance. In a noisy
environment, it is recommended to follow the
guidelines mentioned in the electrical characteris-
tics section.
7.5.3 External Power-On RESET
If the LVD is disabled by option byte, to start up the
microcontroller correctly, the user must ensure by
means of an external reset circuit that the reset
signal is held low until VDD is over the minimum
level specified for the selected fOSC frequency.
A proper reset signal for a slow rising VDD supply
can generally be provided by an external RC net-
work connected to the RESET pin.
7.5.4 Internal Low Voltage Detector (LVD)
RESET
Two different RESET sequences caused by the in-
ternal LVD circuitry can be distinguished:
Power-On RESET
Voltage Drop RESET
The device RESET pin acts as an output that is
pulled low when VDD<VIT+ (rising edge) or
VDD<VIT- (falling edge) as shown in Figure 17.
The LVD filters spikes on VDD larger than tg(VDD) to
avoid parasitic resets.
7.5.5 Internal Watchdog RESET
The RESET sequence generated by a internal
Watchdog counter overflow is shown in Figure 17.
Starting from the Watchdog counter underflow, the
device RESET pin acts as an output that is pulled
low during at least tw(RSTL)out.
Figure 17. RESET Sequences
VDD
RUN
RESET PIN
EXTERNAL
WATCHDOG
ACTIVE PHASE
VIT+(LVD)
VIT-(LVD)
th(RSTL)in
RUN
WATCHDOG UNDERFLOW
tw(RSTL)out
RUN
RESET
SOURCE
EXTERNAL
RESET
LVD
RESET
WATCHDOG
RESET
INTERNAL RESET (256 or 4096 TCPU)
VECTOR FETCH
ACTIVE
PHASE
ACTIVE
PHASE
1
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