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| 型号： | R5F3650MDFB |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | MICROCONTROLLER, PQFP100 |
| 封装： | 14 X 14 MM, 0.50 MM PITCH, LQFP-100 |
| 文件页数： | 28/81页 |
| 文件大小： | 879K |
| 代理商： | R5F3650MDFB |
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46
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
9.
System Control and Reset
9.0.1
Resetting the AVR
During reset, all I/O Registers are set to their initial values, and the program starts execution
from the Reset Vector. 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 9-1 shows the reset
logic. Table 9-1 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 dif-
ferent selections for the delay period are presented in “Clock Sources” on page 31.
9.0.2
Reset Sources
The AT90PWM2/2B/3/3B has four 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 (V
BOT) and the Brown-out Detector is enabled.
Figure 9-1.
Reset Logic
MCU Status
Register (MCUSR)
Brown-out
Reset Circuit
BODLEVEL [2..0]
Delay Counters
CKSEL[3:0]
CK
TIMEOUT
WDRF
BORF
EXTRF
PORF
DATA BUS
Clock
Generator
Spike
Filter
Pull-up Resistor
Watchdog
Oscillator
SUT[1:0]
Power-on Reset
Circuit
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相关代理商/技术参数 |
参数描述 |
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| R5F3650MDFB#30 | 制造商:Renesas Electronics Corporation 功能描述:IC MCU 16BIT 512KB FLASH 100QFP 制造商:Renesas Electronics Corporation 功能描述:M16C Series 16 Bit 512 kB Flash 31 kB Ram SMT Microcontroller - LQFP-100 |
| R5F3650MDFB#U0 | 功能描述:MCU 4KB FLASH 512/16K 100-LQFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:M16C™ M16C/60/65 标准包装:96 系列:PIC® 16F 核心处理器:PIC 芯体尺寸:8-位 速度:20MHz 连通性:I²C，SPI 外围设备:欠压检测/复位，POR，PWM，WDT 输入/输出数:11 程序存储器容量:3.5KB（2K x 14） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:128 x 8 电压 - 电源 (Vcc/Vdd):2.3 V ~ 5.5 V 数据转换器:A/D 8x10b 振荡器型:内部 工作温度:-40°C ~ 125°C 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 包装:管件 |
| R5F3650MDFB#V2 | 制造商:Renesas Electronics Corporation 功能描述:M16C65 FL 512/31 100QFP 2.7-5. 制造商:Renesas Electronics Corporation 功能描述:M16C65 FL 512/31 100QFP 2.7-5.5V -40/85C - Trays 制造商:Renesas Electronics Corporation 功能描述:MCU 32BIT 512KB FLASH 100QFP |
| R5F3650MNFA | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:This MCU consumes low power, and supports operating modes |
| R5F3650MNFB | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:This MCU consumes low power, and supports operating modes |
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