D950-CORE datasheet(21/89 Pages) STMICROELECTRONICS

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D950-Core

4.2.2 Registers

The D950-Core ACU includes two types of registers: data registers and control registers

Data registers:

The following registers are directly addressed by instructions:

•

2 x 16-bit pointer registers and 4 x 16-bit index registers are dedicated for each

data memory space:

•

AX0/AX1 (pointer), IX0/IX1/IX2/IX3 (index) for X-memory space,

•

AY0/AY1 (pointer), IY0/IY1/IY2/IY3 (index) for Y-memory space.

In addition to these registers, 16-bit SP registers address the stacks located in the X and Y-

memory spaces.

The following four registers are mapped in Y-memory space:

•

2 x 16-bit base and maximum address registers are dedicated for each Data

memory space:

•

BX (Base), MX (Maximum) for X-memory space,

•

BY (Base), MY (Maximum) for Y-memory space.

Control Register:

STA: Bits 8 to 13 are dedicated to ACU (see Section 4.5.1). Index register values are 16-bit

signed.

4.2.3 Addressing modes

The D950-Core provides the following addressing modes:.

Addressing Modes

Type

DIRECT

INDIRECT

LINEAR POST- INCREMENT

MODULO POST-INCREMENT

BIT-REVERSE POST-INCREMENT

INDEXED

IMMEDIATE

STACK

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