AT43USB355_06 datasheet(72/115 Pages) ATMEL

72 / 115 page

AT43USB355

2603G–USB–04/06

Port F

In the AT43USB355 Port F[1:3] is a 3-bit bi-directional I/O. Its output buffers can sink or source

2 mA Three I/O memory address locations are allocated for the Port F, one each for the Data

Pins (PIND), $04($24). The Port F Input Pins address is read only, while the Data Register

and the Data Direction Register are read/write.

PF1 to PF3 pins have individually selectable pull-up resistors. When pins PPF1 to PF3 are

used as inputs and are externally pulled low, they will source current if the internal pull-up

resistors are activated.

In the SRAM version of the chip, the AT43USB355E, Port F is used for program memory

downloading immediately after power-on reset. After downloading is completed, PF0 is driven

high, while PF[1:3] becomes available as GPIO. In both versions of the chip, PF3 can be pro-

grammed as ICP, Timer/Counter 1 Input Capture.

Port F Data Register – PORTF

Port F Data Direction Register – DDRF

Port F Input Pins Address – PINF

The Port F Input Pins address (PINF) is not a register, and this address enables access to the

physical value on each Port F pin. When reading PORTF, the Port F Data Latch is read, and

when reading PINF, the logical values present on the pins are read.

Bit

$06 ($26)

–

PORTF3

PORTF2

PORTF1

–

PORTF

Read/Write

R/W

Initial Value

Bit

$05 ($25)

–

DDF3

DDF2

DDF1

–

DDRF

Read/Write

R/W

Initial Value

Bit

$04 ($24)

–

PINF3

PINF2

PINF1

–

PINF

Read/Write

Initial Value

N/A

AT43USB355 датащи(PDF) 72 Page - ATMEL Corporation

AT43USB355 датащи(HTML) 72 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL