Atmel SAM4L-EK Atmel ATSAM4L-EK ATSAM4L-EK Data Sheet

42023E–SAM–07/2013

CFG

Read/Write

0x04

0x00000000

NSU, DUTY, WMOD and XBIAS 

shall not be modified when LCDCA is enabled (SR.EN=1).

This field indicates the number of segment terminals in use. It prevents any activity on muxes driving the unused segment 

terminals.

Defines the maximum voltage V

LCD

 on segment and common terminals. FCST is a signed number (two's complement). New 

value takes effect at the beginning of next frame.

V

LCD

 = 3.0 V + (FCST[5:0] * 0.016 V)

This field defines the duty cycle.

0: Shadow display memory is unlocked.

1: Shadow display memory is locked and can’t be updated.

0: LCD segments value is defined in shadow display memory.

1: Turns OFF all LCD segments.

0: low power waveform mode.

1: standard waveform mode.

31

30

29

28

27

26

25

24

-

-

NSU

23

22

21

20

19

18

17

16

-

-

FCST

15

14

13

12

11

10

9

8

-

-

-

-

-

-

DUTY

7

6

5

4

3

2

1

0

-

-

-

-

LOCK

BLANK

WMOD

XBIAS

Table 39-13. Duty Selection

0 0

1/4

1/3

COM[0:3]

0 1

Static

Static

COM0

1 0

1/2

1/3

COM[0:1]

1 1

1/3

1/3

COM[0:2]