AS3665 datasheet(47/78 Pages) AMSCO

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AS3665

Datasheet, Confidential - Prog ramming Progra m E x e c u t io n a nd Debug ging

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. The AS3665 operating mode should be standby or active - see Device Operating Mode on page 12

2. Set the LED currents - see Current Sources on page 15

3. The charge pump usually can be left at their default setting - see CP setting Application Hint on page 31

4. Download of program: see Program Downloading on page 43.

5. Write the program start addresses to registers start_addr1, start_addr2 and start_addr3

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

16.Assuming all three sequencers are actually used for the program.

17.The demoboard software simplifies the debugging using a graphical user interface.

Table 56. Exec_Enable Register

Addr: 00h

Exec_Enable Register

Bit

Bit Name

Default Access

Description

1:0

p1_en

00b

R/W

Execution enable for sequencer 1

Sequencer 1 is disabled

Reload program counter and enable:

set PC1 to start_addr1, initialize sequencer 1 internal

loop counters then set p1_en=10 (run)

Execute sequencer commands as defined by

p1_mode

don’t use

3:2

p2_en

00b

R/W

Execution enable for sequencer 2

Sequencer 2 is disabled

Reload program counter and enable:

set PC2 to start_addr2, initialize sequencer 2 internal

loop counters then set p2_en=10 (run)

Execute sequencer commands as defined by

p2_mode

don’t use

AS3665 Datasheet(PDF) 47 Page - ams AG

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