Atmel SAM4L Xplained Pro Evaluation Kit Atmel ATSAM4L-XPRO ATSAM4L-XPRO Data Sheet

42023E–SAM–07/2013

Up to eight segments can be selected individually to blink. Each bit in Blink Segment Selection x
field (BCFG.BSSx) selects a segment for blinking. If BSS0[y]=1, segment connected to
SEG0/COMy is selected to blink. If BSS1[y]=1, segment connected to SEG1/COMy is selected
to blink.

A segment will blink if its corresponding bit is one in the display memory, otherwise it remains
OFF.

The blink frequency is defined by the number of frames (FCx in TIM register) between each
state ON/OFF. So after FCx+1 frames, the segment will change state. Note that blinking fre-
quency is also related to waveform mode, see 

The frame counter is selected by writing its number in BCFG.FCS field. BCFG.BSSx and
BCFG.MODE should be modified after a frame has ended (SR.FC0R=1), BCFG.FCS shall not
be modified when blinking is running.

The blinking is started by writing a one to CR.BSTART and stopped by writing a one to
CR.BSTOP. The status of blinking can be read in SR.BLKS.

Up to eight pixels can be animated by an internal circular shift register. Up to eight states are
then defined to make a running wheel for example. The number of segments used for animation
must be written in SIZE field in Circular Shift Register Configuration (CSRCFG). If SIZE=N, cir-
cular shift register uses bits 0 to N-1.

The circular shift register bits are mapped on SEG2 and SEG3 of all common terminals.

Blinking Modes

1

x

xxxx xxxx

All segments are OFF

0

0

xxxx xxxx

All segments are driven by the display memory

0

1

0000 0000

All segments are blinking at the blink frequency

Not equal to zero

Selected segment(s) are blinking at the blink 
frequency

Circular Shift Register Bit Mapping

0

0

2

1

0

3

2

1

2

3

1

3

4

2

2

5

2

3

6

3

2

7

3

3