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PMAC 2 Software Reference

PMAC On-Line Command Specification 255

M161->D40 ; Motor 1 desired position register specified in decimal

M162->D$2C ; Motor 1 actual position register specified in hex

See Also

M-Variables (Computational Features)

On-line commands M{constant}, M{constant}->,

M{constant}={expression}

Program command M{constant}={expression}

M{constant}->DP:{address}

Function

Dual-Ported RAM Fixed-Point M-Variable Definition

Scope

Global

Syntax

M{constant}[..{constant}]->DP[:]{address}

where:

• {constant} is an integer from 0 to 1023 representing the number of the M-variable;

• the optional second{constant} must be at least as great as the first {constant} – it

represents the number of the end of the range;

• {address} is an integer constant from 0 to 65,535 ($0 to $FFFF if specified in hex).

Note:

Spaces are not permitted between the M-variable name and the arrow

double character in this command.

Remarks

This command causes PMAC to define the specified M-variable or range of M-variables to

point to 32 bits of data in the low 16 bits of both X and Y memory at the specified location in

PMAC’s address space. The data is interpreted as a fixed-point signed (two’s complement)

integer.

The definition consists of the letters DP, an optional colon (:), and the word address.

This format is only useful for dual-ported RAM locations $D000 to $DFFF (Option 2 is

required). With this format, the host can read or write to the corresponding location with a

standard 32-bit integer data format. The data in the X word is the most significant word,

which means on the host side the most significant word is in the higher of two consecutive

addresses (standard Intel format).

Example

M150->DP:$D200

M250->DP$D201