参数资料
型号: ST62P09CM1/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20
封装: 0.300 INCH, PLASTIC, SOP-20
文件页数: 22/104页
文件大小: 1487K
代理商: ST62P09CM1/XXX
ST6208C/ST6209C/ST6210C/ST6220C
24/104
5.3 RESET
5.3.1 Introduction
The MCU can be reset in three ways:
s
A low pulse input on the RESET pin
s
Internal Watchdog reset
s
Internal Low Voltage Detector (LVD) reset
5.3.2 RESET Sequence
The basic RESET sequence consists of 3 main
phases:
s
Internal (watchdog or LVD) or external Reset
event
s
A delay of 2048 clock (fINT) cycles
s
RESET vector fetch
The reset delay allows the oscillator to stabilise
and ensures that recovery has taken place from
the Reset state.
The RESET vector fetch phase duration is 2 clock
cycles.
When a reset occurs:
– The stack is cleared
– The PC is loaded with the address of the Reset
vector. It is located in program ROM starting at
address 0FFEh.
A jump to the beginning of the user program must
be coded at this address.
– The interrupt flag is automatically set, so that the
CPU is in Non Maskable Interrupt mode. This
prevents the initialization routine from being in-
terrupted. The initialization routine should there-
fore be terminated by a RETI instruction, in order
to go back to normal mode.
Figure 13. RESET Sequence
VDD
RESET PIN
WATCHDOG
VIT+
VIT-
WATCHDOG UNDERFLOW
RESET
2048 CLOCK CYCLE (fINT) DELAY
LVD
RESET
INTERNAL
RUN
RESET
RUN
RESET
1
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