Rainbow-electronics AT77C104B Manual do Utilizador descarregar pdf (Página 16)

AT77C104B

5347B–BIOM–08/04

Notes: 1. Navfreq and Navv registers should not be changed once the navigation mode is

selected. Finger sensitivity refers to the minimum level of information required from a

finger. The sensitivity is linked to the integration time; a longer integration time

enables better sensitivity but does not tolerate fast movement.

2. The navigation frequency is the frequency needed for the reading of one new naviga-

tion frame.

3. The Clickv register should not be changed once the click mode is selected.

Clickctrl Register Register Name:Clickctrl (7 bits)

Access Type:Read/Write

Function:Click control

• CLICKFREQ: click pixels reading frequency

00: 180 Hz

01: 90 Hz (default value)

10: 60 Hz

11: 45 Hz

Faster frequency enables faster finger click detection. Lower frequency enables higher

sensitivity.

• CLICKDET: threshold for selecting the black/white color of a slice

00: more than 7 black/white pixels and less than 5 white/black pixels

01: more than 8 black/white pixels and less than 4 white/black pixels

10: more than 9 black/white pixels and less than 3 white/black pixels

11: more than 10 black/white pixels and less than 2 white/black pixels

• CLICKCPT: click detection counter (maximum number of slices read between

two transitions)

000: 5

001: 7

010: 10

011: 12

100: 16

101: 20

110: 25

111: 31

Two transitions are interpreted as a click if the number of slices between them is less

than CLICKCPT. This is used to differentiate a touch-down/touch-up from a real click. A

click is equivalent to two close touch-down/touch-up transitions.

b6 b5 b4 b3 b2 b1 b0

CLICKFREQ

(MSB)

CLICKFREQ

(LSB)

CLICKDET

(MSB)

CLICKDET

(LSB)

CLICKCPT

(MSB)

CLICKCPT CLICKCPT

(LSB)

0101101

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 35 36

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