SAM4L Datasheet, PDF (1047/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
39.7.2 Configuration Register
Name:
CFG
Access Type:
Read/Write
Offset:
0x04
Reset Value:
0x00000000
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
NSU, DUTY, WMOD and XBIAS shall not be modified when LCDCA is enabled (SR.EN=1).
• NSU: Number of Segment Terminals in Use
This field indicates the number of segment terminals in use. It prevents any activity on muxes driving the unused segment
terminals.
• FCST: Fine Contrast
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)
• DUTY: Duty Select
This field defines the duty cycle.
Table 39-13. Duty Selection
DUTY[1:0]
Duty
Bias
00
1/4
1/3
01
Static
Static
10
1/2
1/3
11
1/3
1/3
COM pins Used
COM[0:3]
COM0
COM[0:1]
COM[0:2]
• LOCK: Lock
0: Shadow display memory is unlocked.
1: Shadow display memory is locked and can’t be updated.
• BLANK: Blank LCD
0: LCD segments value is defined in shadow display memory.
1: Turns OFF all LCD segments.
• WMOD: Waveform Mode
0: low power waveform mode.
1: standard waveform mode.
42023C–SAM–02/2013
1047