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AT43USB355 bảng dữ liệu(PDF) 73 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) 73 Page - ATMEL Corporation

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AT43USB355
2603G–USB–04/06
PortF as General
Digital I/O
PFn, General I/O Pin: In the AT43USB355E, after firmware downloading, the DDFn bit in the
DDRF register selects the direction of this pin. If DDFn is set (one), PFn is con-figured as an
output pin. If DDFn is cleared (zero), PFn is configured as an input pin. If PORTFn is set (one)
when the pin is configured as an input pin, the MOS pull-up resistor is activated. To switch the
pull-up resistor off, the PORTFn has to be cleared (zero) or the pin has to configured as an
output pin. The Port F pins are tri-stated when a reset condition becomes active, except PFO
of the AT43USB355E. This pin is dedicated as the slave select pin for the SEEPROM.
Note:
n: 3, 2, 1, pin number.
Table 29. DDFn Bits on Port F Pins
DDFn
PORTFn
I/O
Comment
0
0
Input
Tri-state (Hi-Z)
0
1
Input
PFn will source current if ext. pulled low.
1
0
Output
Push-Pull Zero Output
1
1
Output
Push-Pull One Output



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