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LP5521
www.ti.com
SNVS441F – JANUARY 2007 – REVISED FEBRUAY 2013
PWM Control
Value
End of 1st Ramp command,
start next command
End of 2nd Ramp command,
start next command
Rising ramp,
8
7
6
5
4
Sign = 0
Increment = 4
=> 5 cycles
Current value
3
Downward
2
Step time = 31.2 ms
ramp, Sign = 1
1
Steps
1
2
3
4
5
6
7
8
9
10
Figure 26. Example of 2 sequential ramp commands.
SET PWM
Set PWM output value from 0 to 255. Command takes sixteen 32 kHz clock cycles (= 488 μ s). Setting register
00H bit LOG_EN sets the scale from linear to logarithmic.
Table 12. Set PWM command
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
1
0
0
0
0
0
0
PWM value
GO TO START
Go to start command resets Program Counter register and continues executing program from the 00H location.
Command takes sixteen 32 kHz clock cycles. Note that default value for all program memory registers is 0000H,
which is Go to start command.
Go to start command
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
0
BRANCH
When branch command is executed, the 'step number' value is loaded to PC and program execution continues
from this location. Looping is done by the number defined in loop count parameter. Nested looping is supported
(loop inside loop). The number of nested loops is not limited. Command takes sixteen 32kHz clock cycles.
Table 13. Branch command
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1
0
1
Loop count
X
X
X
Step number
Name
loop count
step number
Value(d)
0-63
0-15
Description
The number of loops to be done. 0 means infinite loop.
The step number to be loaded to program counter.
END
End program execution, resets the program counter and sets the corresponding EXEC register to 00b (hold).
Command takes sixteen 32 kHz clock cycles.
Table 14. End command
15
1
14
1
13
0
12
int
11
reset
10
X
9
X
8
X
7
X
6
X
5
X
4
X
3
X
2
X
1
X
0
X
Copyright ? 2007–2013, Texas Instruments Incorporated
Product Folder Links: LP5521
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