參數(shù)資料
型號(hào): ST72321BAR7T6
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: MICROCONTROLLER, QFP64
封裝: 10 X 10 MM, ROHS COMPLIANT, LQFP-64
文件頁(yè)數(shù): 107/187頁(yè)
文件大?。?/td> 3071K
代理商: ST72321BAR7T6
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ST72321BRx, ST72321BARx ST72321BJx, ST72321BKx
26/187
6.3 RESET SEQUENCE MANAGER (RSM)
6.3.1 Introduction
The reset sequence manager includes three RE-
SET sources as shown in Figure 14:
External RESET source pulse
Internal LVD RESET (Low Voltage Detection)
Internal WATCHDOG RESET
These sources act on the RESET pin and it is al-
ways kept low during the delay phase.
The RESET service routine vector is fixed at ad-
dresses FFFEh-FFFFh in the ST7 memory map.
The basic RESET sequence consists of 3 phases
as shown in Figure 13:
Active Phase depending on the RESET source
256 or 4096 CPU clock cycle delay (selected by
option byte)
RESET vector fetch
The 256 or 4096 CPU clock cycle delay allows the
oscillator to stabilise and ensures that recovery
has taken place from the Reset state. The shorter
or longer clock cycle delay should be selected by
option byte to correspond to the stabilization time
of the external oscillator used in the application
The RESET vector fetch phase duration is 2 clock
cycles.
Figure 13. RESET Sequence Phases
Caution: When the ST7 is unprogrammed or fully
erased, the Flash is blank and the RESET vector
is not programmed.
For this reason, it is recommended to keep the
RESET pin in low state until programming mode is
entered, in order to avoid unwanted behavior.
6.3.2 Asynchronous External RESET pin
The RESET pin is both an input and an open-drain
output with integrated RON weak pull-up resistor.
This pull-up has no fixed value but varies in ac-
cordance with the input voltage. It can be pulled
low by external circuitry to reset the device. See
page 158 for more details.
A RESET signal originating from an external
source must have a duration of at least th(RSTL)in in
order to be recognized (see Figure 15). This de-
tection is asynchronous and therefore the MCU
can enter reset state even in HALT mode.
Figure 14. Reset Block Diagram
RESET
Active Phase
INTERNAL RESET
256 or 4096 CLOCK CYCLES
FETCH
VECTOR
RESET
RON
VDD
WATCHDOG RESET
LVD RESET
INTERNAL
RESET
PULSE
GENERATOR
Filter
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