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AT43USB355 bảng dữ liệu(PDF) 23 Page - ATMEL Corporation

tên linh kiện AT43USB355
Giải thích chi tiết về linh kiện  Full-speed USB Microcontroller with Embedded Hub, ADC and PWM
PDF  115 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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AT43USB355 bảng dữ liệu(HTML) 23 Page - ATMEL Corporation

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AT43USB355
2603G–USB–04/06
When the USB hardware is reset, the compound device is de-configured and has to be re-
enumerated by the host. When the microcontroller is reset, all I/O registers are then set to their
initial values, and the program starts execution from address $000. The instruction placed in
address $000 must be a JMP 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 shows the reset logic.
Figure 9. 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 VCC
rise time.
If the build-in start-up delay is sufficient, RESETN 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
1 MHz Clock
S
R
ON



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