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參數(shù)資料
| 型號(hào)： | R5F21274JFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP32 |
| 封裝： | 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32 |
| 文件頁數(shù)： | 19/52頁 |
| 文件大?。?/td> | 620K |
| 代理商： | R5F21274JFP |
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ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]
8285E–AVR–02/2013
11. System control and reset
11.1
Resetting the AVR
During reset, all I/O Registers are set to their initial values, and the program starts execution from the Reset Vec-
tor. The instruction placed at the Reset Vector must be a JMP – Absolute Jump – instruction to the reset handling
routine. If the program never enables an interrupt source, the Interrupt Vectors are not used, and regular program
code can be placed at these locations. This is also the case if the Reset Vector is in the Application section while
the Interrupt Vectors are in the Boot section or vice versa. The circuit diagram in Figure 11-1 on page 44 shows the
reset logic. Table 28-13 on page 297 defines the electrical parameters of the reset circuitry.
The I/O ports of the AVR are immediately reset to their initial state when a reset source goes active. This does not
require any clock source to be running.
After all reset sources have gone inactive, a delay counter is invoked, stretching the internal reset. This allows the
power to reach a stable level before normal operation starts. The time-out period of the delay counter is defined by
the user through the SUT and CKSEL Fuses. The different selections for the delay period are presented in ”Clock
11.2
Reset Sources
The Atmel ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P has five sources of reset:
Power-on Reset
The MCU is reset when the supply voltage is below the Power-on Reset threshold (V
POT)
External Reset
The MCU is reset when a low level is present on the RESET pin for longer than the minimum pulse length
Watchdog Reset
The MCU is reset when the Watchdog Timer period expires and the Watchdog is enabled
Brown-out Reset
The MCU is reset when the supply voltage V
CC is below the Brown-out Reset threshold (VBOT) and the Brown-out
Detector is enabled
JTAG AVR Reset
The MCU is reset as long as there is a logic one in the Reset Register, one of the scan chains of the JTAG
system. Refer to the section ”IEEE 1149.1 (JTAG) Boundary-scan” on page 215 for details
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| R5F21274JFP#U0 | 功能描述:MCU FLASH 2K FLASH 16K 32LQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:R8C/2x/27 標(biāo)準(zhǔn)包裝:250 系列:80C 核心處理器:8051 芯體尺寸:8-位 速度:16MHz 連通性:EBI/EMI，I²C，UART/USART 外圍設(shè)備:POR，PWM，WDT 輸入/輸出數(shù):40 程序存儲(chǔ)器容量:- 程序存儲(chǔ)器類型:ROMless EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-LCC（J 形引線） 包裝:帶卷 (TR) |
| R5F21274JFP#W4 | 制造商:Renesas Electronics Corporation 功能描述:MCU 3/5V - Tape and Reel |
| R5F21274JXXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MCU |
| R5F21274KFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:RENESAS 16-BIT SINGLE-CHIP MCU R8C FAMILY / R8C/2x SERIES |
| R5F21274KXXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MCU |
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