參數(shù)資料
型號: AT90S8515-8AC
廠商: Atmel
文件頁數(shù): 30/112頁
文件大小: 0K
描述: IC MCU 8K FLSH 8MHZ 44TQFP
標準包裝: 160
系列: AVR® 90S
核心處理器: AVR
芯體尺寸: 8-位
速度: 8MHz
連通性: SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 8KB(4K x 16)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 512 x 8
RAM 容量: 512 x 8
電壓 - 電源 (Vcc/Vdd): 4 V ~ 6 V
振蕩器型: 內(nèi)部
工作溫度: 0°C ~ 70°C
封裝/外殼: 44-TQFP
包裝: 托盤
24
AT90S8515
0841G–09/01
The user can select the start-up time according to typical oscillator start-up. The number
of WDT oscillator cycles used for each time-out is shown in Table 4. The frequency of
the Watchdog Oscillator is voltage-dependent as shown in “Typical Characteristics” on
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 (VPOT), regardless of the VCC rise time (see Figure 24). The
FSTRT Fuse bit in the Flash can be programmed to give a shorter start-up time if a
ceramic resonator or any other fast-start oscillator is used to clock the MCU.
If the built-in start-up delay is sufficient, RESET can be connected to VCC directly or via
an external pull-up resistor. By holding the pin low for a period after VCC has been
applied, the Power-on Reset period can be extended. Refer to Figure 25 for a timing
example of this.
Figure 24. MCU Start-up, RESET Tied to VCC.
Figure 25. MCU Start-up, RESET Controlled Externally
Table 4. Number of Watchdog Oscillator Cycles
FSTRT
Time-out at V
CC = 5V
Number of WDT Cycles
Programmed
0.28 ms
256
Unprogrammed
16.0 ms
16K
VCC
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
VCC
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
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