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AS3665
Datasheet, Confidential - P r o g r a m m i n g P r o g r a m E x e c u t i o n a n d D e b u g g i n g
It uses the command delivered by the sequencers, executes them, converts the data from linear to logarithmic repre-
sentation add color correction and a master value. This signal is then feed into the actual PWM generator which con-
trols the LED current source.
Program Execution and Debugging
Following steps are required for the setup of the AS3665 and execution of a program
1.
2.
3.
4.
The AS3665 operating mode should be standby or active - see Device Operating Mode on page 12
Set the LED currents - see Current Sources on page 15
The charge pump usually can be left at their default setting - see CP setting Application Hint on page 31
Download of program: see Program Downloading on page 43 .
5. Write the program start addresses to registers start_addr1 , start_addr2 and start_addr3
16
6. Initialize the program counters PC1 ... PC3 by setting p1_en =01, p2_en =01 and p3_en =01. The program exe-
cution is automatically enabled ( p1_en ... p3_en is set to 10 by the AS3665).
7. Set AS3665 operating mode to active by setting chip_en =1 - see Device Operating Mode on page 12
8. Execute the program by setting p1_mode=10, p2_mode=10 and p3_mode=10
Sequencers can be stopped by setting p1_mode ... p3_mode =00 (hold). Single step debugging is achieved by
setting p1_mode ... p3_mode =01.
17
The program counter can be controller either by direct writing to registers
PC1 ... PC3 or reset with p1_en ... p3_en as shown above
9. Use AS3665 standby mode (set chip_en =0) to stop all programs and disable all current sources
Table 56. Exec_Enable Register
Addr: 00h
Exec_Enable Register
Bit
Bit Name
Default Access
Description
Execution enable for sequencer 1
00
Sequencer 1 is disabled
1
1:0
p1_en
00b
R/W
Reload program counter and enable:
01 set PC1 to start_addr1 , initialize sequencer 1 internal
loop counters then set p1_en =10 (run)
10
11
Execute sequencer commands as defined by
p1_mode
don’t use
Execution enable for sequencer 2
00
Sequencer 2 is disabled
1
3:2
p2_en
00b
R/W
Reload program counter and enable:
01 set PC2 to start_addr2 , initialize sequencer 2 internal
loop counters then set p2_en =10 (run)
10
11
Execute sequencer commands as defined by
p2_mode
don’t use
16.Assuming all three sequencers are actually used for the program.
17.The demoboard software simplifies the debugging using a graphical user interface.
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