AS3661 datasheet(77/87 Pages) AMSCO

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AS3661

Datasheet - D e t a i l e d D e s c r i p t i o n

8.14.3 BRANCH (Variables)

The BRANCH command for variables has basically the same functionality like the numerical command. The only

difference is that the loop count is controlled with variables instead of having a fixed number.

COMPILER COMMAND SYNTAX: BRV, step number[7], loop count[2];

8.14.4 INT

Send interrupt to processor by pulling the INT pin down and setting corresponding status bit high. Interrupt can be

cleared by reading interrupt bits in STATUS/INTERRUPT register at address 3A.

COMPILER COMMAND SYNTAX: INT;

This command doesn’t support any parameters.

8.14.5 END

End program execution. Instruction takes sixteen 32 kHz clock cycles.

COMPILER COMMAND SYNTAX: END, int[1], Reset[1];

8.14.5.1 END Application Example

The example code below sends an interrupt to the processor and resets the program counts to 0. The program

execution engine is set on hold.

COMPILER COMMAND SYNTAX EXAMPLE: END, 1, 0;

8.14.6 TRIGGER

Wait or send triggers can be used to e.g. synchronize operation between the program execution engines. Send trigger

instruction takes sixteen 32 kHz clock cycles and wait for trigger takes at least sixteen 32 kHz clock cycles. The

receiving engine stores the triggers which have been sent. Received triggers are cleared by wait for trigger instruction.

Wait for trigger instruction is executed until all the defined triggers have been received (note: several triggers can be

defined in the same instruction).

Table 87. BRN Parameter Description

Name

Accepted Value

Description

step number

0-95

The step number to be loaded to program counter

loop count

0-3

Selects the variable for step number value. Step number is loaded with the

value of the variable defined below

local variable A

local variable B

local variable C

Table 88. END Parameter Description

Name Value

Description

int

No interrupt will be sent. PWM register values will remain intact.

Reset program counter value to 0 and send interrupt to processor by pulling the INT pin down and

setting corresponding status bit high to notify that program has ended. PWM register values will

remain intact. Interrupt can be cleared by reading interrupt bits in STATUS/INTERRUPT register at

address 3A.

Reset

Reset program counter value to 0 and hold. PWM register values will remain intact.

Reset program counter value to 0 and hold. PWM register values of the non-mapped drivers will

remain. PWM register values of the mapped drivers will be set to "0000 0000". On completion of int

instruction with this bit set to "1" the master fader registers are set to zero as follows: Program

execution engine 1 sets MASTER FADER 1 (48H) to zero, engine 2 sets MASTER FADER 2 (49H) to

zero and engine 3 sets MASTER FADER 3 (4AH) to zero.

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