參數(shù)資料
型號： ST72F321M
廠商： 意法半導體
英文描述： 80-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C INTERFACE(具有ICP,IAP,Nested Interrupt,TLI,ROP的8位MCU)
中文描述： 80引腳8位微控制器32至60,000閃存/ ROM，ADC的，5個定時器，SPI和SCI的I2C接口（具有比較方案，國際檢察官聯(lián)合會，嵌套中斷，中華語文研習所，人事登記的8位微控制器）
文件頁數(shù)： 25/178頁
文件大小： 3121K
代理商： ST72F321M
ST72F321M, ST72321BM
25/178
6.3 RESET SEQUENCE MANAGER (RSM)
6.3.1 Introduction
The reset sequence manager includes three RE-
SET sources as shown in
Figure 12
:
■
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 11
:
■
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
(see
section 13.1 on page 169
).
The RESET vector fetch phase duration is 2 clock
cycles.
Figure 11. RESET Sequence Phases
6.3.2 Asynchronous External RESET pin
The RESET pin is both an input and an open-drain
output with integrated R
ON
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
“CONTROL
PIN
CHARACTERISTICS”
page 155
for more details.
A RESET signal originating from an external
source must have a duration of at least t
h(RSTL)in
in
order to be recognized (see
Figure 13
). This de-
tection is asynchronous and therefore the MCU
can enter reset state even in HALT mode.
on
Figure 12. Reset Block Diagram
RESET
Active Phase
INTERNAL RESET
256 or 4096 CLOCK CYCLES
FETCH
VECTOR
RESET
R
ON
V
DD
WATCHDOG RESET
LVD RESET
INTERNAL
RESET
PULSE
GENERATOR
Filter
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST72F321M6T6 制造商:STMicroelectronics 功能描述:
ST72F321M7T6 制造商:STMicroelectronics 功能描述:8-BIT FLASH MICROCONTROLLER - Bulk
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ST72F321R6T6TR 功能描述:8位微控制器 -MCU 8B MCU RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
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