Rainbow-electronics AT77C105A Manual de usuario descargar pdf (Pagina 27)

AT77C105A [Preliminary]

5419A–BIOM–01/05

Figure 13. Example of an 8-bit Access

During an 8-bit access, the sensor transmits two pixels (each pixel is coded on 4 bits).

Figure 14. Fast SPI Communication

Communication Speed The acquisition speed of the pixels is linked to the clock’s communication speed. The

faster the communication clock, the faster the authorized maximum finger sweeping

speed. The sensor supports fast communications up to 16 Mbps.

Reading of Frame A frame consists of 232 true columns and 1 dummy column of 8 pixels of 4 bits each. A

frame starts with a dummy column.

Figure 15. Example of a Frame

FSS/ = 0

Sending of Dummy Data

0b0000000

Reception of 2 Pixels

End of

Communication

Sending of 2 Pixels (8 Bits)

FSS/ = 1

Yes

Controller

Sensor

Bit2

Bit3

MSB

Bit1

Bit0 Bit3 Bit2 Bit1 Bit0 Bit2 Bit1 Bit0

Bit3 Bit2 Bit1 Bit0

Bit3

MSB

SCK (Pixel Clock)

MISO

Transmission Clock

Edge (Sensor)

Reception Clock

Edge (Host)

Pixel 2i

Pixel 2i - 1

Pixel 2i + 2 Pixel 2i + 1

Pixel Frame

p10

p11

P12

P13

P14

P15

p16

Synchro = F0F00200

Dummy

Column

232 x 8 Pixels Column

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 38 39

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Rainbow-electronics AT77C105A Manual de usuario Pagina 27

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