AS3661 datasheet(37/87 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

8.10.2 ENGINE CNTRL2

The AS3661 supports up to four different operation modes which are defined in these registers.

Disabled: Engines can be configured to disabled mode each one separately.

Load program: Writing to program memory is allowed only when the engine is in load program operation mode and

engine busy bit (reg 3A) is not set. Serial bus master should check the busy bit before writing to program memory. All

the three engines are in hold while one or more engines are in load program mode. PWM values are frozen, also.

Program execution continues when all the engines are out of load program mode. Load program mode resets the

program counter of the respective engine. Load program mode can be entered from the disabled mode only. Entering

load program mode from the run program mode is not allowed.

Run Program: Run program mode executes the instructions stored in the program memory. Execution register

(ENG1_EXEC etc.) bits define how the program is executed (hold, step, free run or execute once). Program start

address can be programmed to the Program Counter (PC) register. The Program Counter is reset to zero when the

PC’s upper limit value is reached.

Halt: Instruction execution aborts immediately and engine operation halts.

3:2

ENGINE2_EXEC

R/W

The engine 2 program execution control register bits define

how the program is executed. Program start address can be

programmed to program counter (PC) register 0x38.

00: Hold causes the execution engine to finish the current

instruction and then stop. Program counter (PC) can be

read or written only in this mode.

01: Execute the instruction at the location pointed by the PC,

increment the PC by one and then reset ENG2_EXEC bits to

00 (i.e. enter hold).

10: Start program execution from the location pointed by the

PC. This mode is also called “Free Run” mode.

11: Execute the instruction pointed by the current PC value

and reset ENG2_EXEC to 00 (i.e. enter hold). The difference

between step and execute once is that execute once does not

increment the PC.

1:0

ENGINE3_EXEC

R/W

The engine 3 program execution control register bits define

how the program is executed. Program start address can be

programmed to program counter (PC) register 0x39.

00: Hold causes the execution engine to finish the current

instruction and then stop. Program counter (PC) can be

read or written only in this mode.

01: Executes the instruction at the location pointed by the PC,

increment the PC by one and then reset ENG3_EXEC bits to

00 (i.e. enter hold).

10: Start program execution from the location pointed by the

PC. This mode is also called “Free Run” mode.

11: Execute the instruction pointed by the current PC value

and reset ENG3_EXEC to 00 (i.e. enter hold). The difference

between step and execute once is that execute once does not

increment the PC.

Table 8. ENABLE / ENGINE CNTR 1 Register

ENABLE / ENGINE CNTR1

Bit

Bit Name

Default

Access

Bit Description

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