Datasheet

581
32133D–11/2011
UC3D
27.7.4 Autonomous/DMA Touch Configuration Register 0
Name:
ATCFG0
Access Type: Read/Write
Offset: 0x10
Reset Value: 0x00000000
•DIV: Clock Divider
The prescaler is used to ensure that the CLK_CAT clock is divided to around 1 MHz to produce the sampling clock.The
prescaler uses the following formula to generate the sampling clock:
Sampling clock = CLK_CAT / (2(DIV+1))
• CHLEN: Charge Length
For the autonomous QTouch sensor and DMATouch sensors, specifies how many sample clock cycles should be used for
transferring charge to the sense capacitor.
• SELEN: Settle Length
For the autonomous QTouch sensor and DMATouch sensors, specifies how many sample clock cycles should be used for
settling after charge transfer.
31 30 29 28 27 26 25 24
DIV[15:8]
23 22 21 20 19 18 17 16
DIV[7:0]
15 14 13 12 11 10 9 8
CHLEN
76543210
SELEN