參數(shù)資料
型號: ATTINY43U-SUR
廠商: Atmel
文件頁數(shù): 106/158頁
文件大?。?/td> 0K
描述: MCU AVR 4KB FLASH 8MHZ 20SOIC
產(chǎn)品培訓模塊: tinyAVR Introduction
標準包裝: 1,000
系列: AVR® ATtiny
核心處理器: AVR
芯體尺寸: 8-位
速度: 8MHz
連通性: USI
外圍設備: 欠壓檢測/復位,POR,PWM,溫度傳感器,WDT
輸入/輸出數(shù): 16
程序存儲器容量: 4KB(2K x 16)
程序存儲器類型: 閃存
EEPROM 大小: 64 x 8
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 5.5 V
數(shù)據(jù)轉換器: A/D 4x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 20-SOIC(0.295",7.50mm 寬)
包裝: 帶卷 (TR)
其它名稱: ATTINY43U-SUR-ND
51
8048C–AVR–02/12
ATtiny43U
9.2.2
External Reset
An External Reset is generated by a low level on the RESET pin if enabled. Reset pulses longer
than the minimum pulse width (see Table 20-4 on page 161) will generate a reset, even if the
clock is not running. Shorter pulses are not guaranteed to generate a reset. When the applied
signal reaches the Reset Threshold Voltage – V
RST – on its positive edge, the delay counter
starts the MCU after the Time-out period – t
TOUT – has expired.
Figure 9-4.
External Reset During Operation
9.2.3
Brown-out Detection
ATtiny43U has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
CC level during
operation by comparing it to a fixed trigger level. The trigger level for the BOD can be selected
by the BODLEVEL Fuses. The trigger level has a hysteresis to ensure spike free Brown-out
Detection. The hysteresis on the detection level should be interpreted as V
BOT+ = VBOT + VHYST/2
and V
BOT- = VBOT - VHYST/2.
When the BOD is enabled, and V
CC decreases to a value below the trigger level (VBOT- in Figure
9-5 on page 51), the Brown-out Reset is immediately activated. When V
CC increases above the
trigger level (V
BOT+ in Figure 9-5 on page 51), the delay counter starts the MCU after the Time-
out period t
TOUT has expired.
The BOD circuit will only detect a drop in V
CC if the voltage stays below the trigger level for lon-
ger than t
Figure 9-5.
Brown-out Reset During Operation
It is recommended to use only the lowest BOD level (1.8V), when using the integrated boost
CC
VCC
RESET
TIME-OUT
INTERNAL
RESET
VBOT-
VBOT+
tTOUT
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