參數(shù)資料
型號(hào): AT90LS8535-4AI
廠商: Atmel
文件頁(yè)數(shù): 43/127頁(yè)
文件大?。?/td> 0K
描述: IC MCU 8K 4MHZ A/D LV IT 44TQFP
標(biāo)準(zhǔn)包裝: 160
系列: AVR® 90LS
核心處理器: AVR
芯體尺寸: 8-位
速度: 4MHz
連通性: SPI,UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲(chǔ)器容量: 8KB(4K x 16)
程序存儲(chǔ)器類型: 閃存
EEPROM 大小: 512 x 8
RAM 容量: 512 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 6 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: 44-TQFP
包裝: 托盤
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22
AT90S/LS8535
1041H–11/01
placed at these locations. The circuit diagram in Figure 23 shows the reset logic. Table 3
defines the timing and electrical parameters of the reset circuitry.
Figure 23. Reset Logic
Note:
1. The Power-on Reset will not work unless the supply voltage has been below V
POT
(falling).
Power-on Reset
A Power-on Reset (POR) circuit ensures that the device is reset from power-on. As
shown in Figure 23, an internal timer clocked from the Watchdog Timer oscillator pre-
vents the MCU from starting until after a certain period after V
CC has reached the Power-
on Threshold voltage (V
POT), regardless of the VCC rise time (see Figure 24).
The user can select the start-up time according to typical oscillator start-up time. The
number of WDT oscillator cycles is shown in Table 4. The frequency of the Watchdog
oscillator is voltage-dependent as shown in “Typical Characteristics” on page 107.
If the built-in start-up delay is sufficient, RESET can be connected to V
CC directly or via
an external pull-up resistor. By holding the pin low for a period after V
CC has been
applied, the Power-on Reset period can be extended. Refer to Figure 25 for a timing
example of this.
Table 3. Reset Characteristics (V
CC = 5.0V)
Symbol
Parameter
Min
Typ
Max
Units
VPOT
(1)
Power-on Reset Threshold (rising)
1.0
1.4
1.8
V
Power-on Reset Threshold (falling)
0.4
0.6
0.8
V
RST
RESET Pin Threshold Voltage
0.6 V
CC
V
t
TOUT
Reset Delay Time-out Period
FSTRT Unprogrammed
11.0
16.0
21.0
ms
t
TOUT
Reset Delay Time-out Period
FSTRT Programmed
1.0
1.1
1.2
ms
Table 4. Number of Watchdog Oscillator Cycles
FSTRT
Time-out at V
CC = 5V
Number of WDT Cycles
Programmed
1.1 ms
1K
Unprogrammed
16.0 ms
16K
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