AS3661 datasheet(36/87 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 Control Register Details

8.10.1 ENABLE/ ENGINE CONTROL1

This register controls the startup of the chip and the program execution modes for each program execution engine.

Table 8. ENABLE / ENGINE CNTR 1 Register

ENABLE / ENGINE CNTR1

Bit

Bit Name

Default

Access

Bit Description

CHIP_EN

R/W

0: Standby mode is entered. Still, control registers can be

written or read, excluding bits [5:0] in reg 00 (this

to 39h (program counters).

1: internal startup sequence powers up all the needed internal

blocks and the device enters normal mode.

5:4

ENGINE1_EXEC

R/W

The engine 1 program execution control register bits define

how the program is executed. Program start address can be

programmed to program counter (PC) register 0x37.

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 ENG1_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 ENG1_EXEC to 00 (i.e. enter hold). The difference

between step and execute once is that execute once does not

increment the PC.

AS3661 Datasheet(PDF) 36 Page - ams AG