2317 Rev 1.1 (17NOV04)
AuthenTec Confidential Information
28
6.1.1.2
Control
Register
2
(CTRL2)
(81h)
Read ID
1
Read the ID register of the chip. This bit is self-resetting and will always read back as zero.
Clear One-Shot
1
Clears the one-shot flip-flop. This bit is self-resetting and will always read back as zero.
Set One-Shot
1
Set the one-shot flip-flop to allow a single image scan. As soon as the necessary conditions are met
(finger present, output buffers empty, output channel ready for data, and finger settling delay expired), an
image scan will occur. Note that the Continuous Scan bit must be low for this to have any effect. This bit is
self-resetting. The value read for this bit position indicates a single scan is pending. Scan pending can be reset
by Scan Reset or Master Reset or by the Clear One-Shot bit.
Read Registers
1
Read the current state of the local registers in the Sensor IC. The request is responded to only if not in
Imaging mode. This bit is self-resetting and will always read back as zero.
Continuous Scan
1
Continuous Scan. As long as the necessary conditions are met, image scans will be performed.
0
Controlled Scan. Single scans are initiated by writing a ‘1’ to the Set One-Shot bit.
Reset
Value
D7
D6
D5
D4
D3
D2
D1
D0
Reserved
Read
ID
Clear
One-Shot
Set One-
Shot
Read
Registers
Continuous
Scan
0
0
0
0
0
0
0
0
0
Reserved