Atmel SAM4L Xplained Pro Starter Kit Atmel ATSAM4L-XSTK ATSAM4L-XSTK 数据表
产品代码
ATSAM4L-XSTK
1049
42023E–SAM–07/2013
ATSAM4L8/L4/L2
character string. Number of transfer must be a multiple of STEPS to get a complete scrolling
of the string. Blank characters can be added to string to create a complete scrolling.
of the string. Blank characters can be added to string to create a complete scrolling.
The frame counter selected (TIM.FCx) defines the number of frames between each PDCA trans-
fer, refer to
fer, refer to
Figure 39-12. Characters String Scrolling Examples (DIGN = 3)
39.6.12
Automated Bit Mapping
Any segment can be modified using the Peripheral DMA Controller, making predefined anima-
tions possible. Data can be located in FLASH or RAM and are transferred periodically to the
display memory.
tions possible. Data can be located in FLASH or RAM and are transferred periodically to the
display memory.
When PDCA writes to the Automated Bit Mapping Data Register (ABMDR), up to 8 segments
can be modified. PDCA must be configured to transfer a word made of:
can be modified. PDCA must be configured to transfer a word made of:
• DATA[7:0], each bit represents the state of a segment,
String=’HELLO’
(string length=5, STEPS=3)
H E L
E L L
String=’HELLO ‘
(string length=8, STEPS=6)
L L O
L O
O
H E L
H E L
E L L
L L O
H E L
1
2
3
1
2
3
1
step
1
2
3
4
5
6
1
E L L
L L O
H E L