參數(shù)資料
型號： AT91SAM7S32B-AU
廠商： Atmel
文件頁數(shù)： 120/165頁
文件大?。?/td> 0K
描述： IC MCU ARM7 32KB FLASH 48LQFP
產(chǎn)品培訓模塊： MCU Product Line Introduction
標準包裝： 250
系列： SAM7S
核心處理器： ARM7
芯體尺寸： 16/32-位
速度： 55MHz
連通性： I²C，SPI，SSC，UART/USART
外圍設備： 欠壓檢測/復位，DMA，POR，PWM，WDT
輸入/輸出數(shù)： 21
程序存儲器容量： 32KB（32K x 8）
程序存儲器類型： 閃存
RAM 容量： 8K x 8
電壓 - 電源 (Vcc/Vdd)： 1.65 V ~ 1.95 V
數(shù)據(jù)轉換器： A/D 8x10b
振蕩器型： 內部
工作溫度： -40°C ~ 85°C
封裝/外殼： 48-LQFP
包裝： 托盤
配用： AT91SAM-ICE-ND - EMULATOR FOR AT91 ARM7/ARM9
AT91SAM7S-EK-ND - KIT EVAL FOR ARM AT91SAM7S
58
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
13.3
Functional Description
13.3.1
Reset Controller Overview
The Reset Controller is made up of an NRST Manager, a Brownout Manager, a Startup Counter and a Reset State
Manager. It runs at Slow Clock and generates the following reset signals:
proc_nreset: Processor reset line. It also resets the Watchdog Timer.
periph_nreset: Affects the whole set of embedded peripherals.
nrst_out: Drives the NRST pin.
These reset signals are asserted by the Reset Controller, either on external events or on software action. The
Reset State Manager controls the generation of reset signals and provides a signal to the NRST Manager when an
assertion of the NRST pin is required.
The NRST Manager shapes the NRST assertion during a programmable time, thus controlling external device
resets.
The startup counter waits for the complete crystal oscillator startup. The wait delay is given by the crystal oscillator
startup time maximum value that can be found in the section Crystal Oscillator Characteristics in the Electrical
Characteristics section of the product documentation.
13.3.2
NRST Manager
The NRST Manager samples the NRST input pin and drives this pin low when required by the Reset State Man-
ager. Figure 13-2 shows the block diagram of the NRST Manager.
Figure 13-2. NRST Manager
13.3.2.1
NRST Signal or Interrupt
The NRST Manager samples the NRST pin at Slow Clock speed. When the line is detected low, a User Reset is
reported to the Reset State Manager.
However, the NRST Manager can be programmed to not trigger a reset when an assertion of NRST occurs. Writ-
ing the bit URSTEN at 0 in RSTC_MR disables the User Reset trigger.
The level of the pin NRST can be read at any time in the bit NRSTL (NRST level) in RSTC_SR. As soon as the pin
NRST is asserted, the bit URSTS in RSTC_SR is set. This bit clears only when RSTC_SR is read.
The Reset Controller can also be programmed to generate an interrupt instead of generating a reset. To do so, the
bit URSTIEN in RSTC_MR must be written at 1.
External Reset Timer
URSTS
URSTEN
ERSTL
exter_nreset
URSTIEN
RSTC_MR
RSTC_SR
NRSTL
nrst_out
NRST
rstc_irq
Other
interrupt
sources
user_reset
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AT91SAM7S32B-AU-001 制造商:Atmel Corporation 功能描述:32BIT SMART ARM7 32K FLASH 91SAM7 制造商:Atmel Corporation 功能描述:32BIT SMART ARM7 32K FLASH, 91SAM7
AT91SAM7S32B-AU-999 功能描述:ARM微控制器 - MCU Ind. Temp Green RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:72 MHz 程序存儲器大小:256 KB 數(shù)據(jù) RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風格:SMD/SMT
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