參數(shù)資料
型號: AT43USB320A-AC
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: Full-speed USB Microcontroller with an Embedded Hub
中文描述: 8-BIT, 12 MHz, RISC MICROCONTROLLER, PQFP100
封裝: 14 X 14 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, MS-026AED, LQFP-100
文件頁數(shù): 23/115頁
文件大?。?/td> 722K
代理商: AT43USB320A-AC
23
AT43USB320A
1443E–USB–4/04
Figure 6.
Reset Logic
Power-on Reset
A Power-on Reset (POR) circuit ensures that the device is reset from power-on. An internal
timer clocked from the Watchdog timer oscillator prevents the MCU from starting until after a
certain period after V
CC
has reached the power-on threshold voltage, regardless of the V
CC
rise time.
If the build-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.
FSTRT
Cntr Reset
USB Reset
OR
POR Ckt
Reset Ckt
Watchdog Timer
Divider
14-bit Cntr
VCC
RSTN
System Clock
S
R
ON
Table 7.
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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