参数资料
型号: ATTINY43U-MUR
厂商: Atmel
文件页数: 103/158页
文件大小: 0K
描述: MCU AVR 4KB FLASH 8MHZ 20QFN
产品培训模块: tinyAVR Introduction
标准包装: 6,000
系列: AVR® ATtiny
核心处理器: AVR
芯体尺寸: 8-位
速度: 8MHz
连通性: USI
外围设备: 欠压检测/复位,POR,PWM,温度传感器,WDT
输入/输出数: 16
程序存储器容量: 4KB(2K x 16)
程序存储器类型: 闪存
EEPROM 大小: 64 x 8
RAM 容量: 256 x 8
电压 - 电源 (Vcc/Vdd): 1.8 V ~ 5.5 V
数据转换器: A/D 4x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 20-WFQFN 裸露焊盘
包装: 带卷 (TR)
49
8048C–AVR–02/12
ATtiny43U
9.
System Control and Reset
9.1
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 RJMP – Relative
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. The circuit diagram in Figure 9-1 shows the reset logic. Table 20-4 on page 161
defines the electrical parameters of the reset circuitry.
Figure 9-1.
Reset Logic
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 24.
MCU Status
Register (MCUSR)
Brown-out
Reset Circuit
BODLEVEL[2:0]
Delay Counters
CKSEL[1:0]
CK
TIMEOUT
WDRF
BORF
EX
TRF
PORF
DATA BUS
Clock
Generator
SPIKE
FILTER
Pull-up Resistor
Watchdog
Oscillator
SUT[1:0]
Power-on Reset
Circuit
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