TMS320F datasheet(92/389 Pages) TI

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TMS320F Datasheet(PDF) 92 Page - Texas Instruments

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Direct Addressing Mode

6-8

In Example 6–5, the ADDC instruction references a data memory address that

is generated as shown following the program code. You should note that if an

instruction does not perform shifts (such as the ADDC instruction), all eight

MSBs of the instruction contain the opcode for the instruction type.

Example 6–5. Using Direct Addressing with ADDC

LDP #500

;Set data page to 500 (addresses FA00h–FA7Fh).

ADDC 6h

;The contents of data address FA06h

;and the value of the carry bit (C) are

;added to the contents of the accumulator.

7 LSBs from IR

16-bit data address FA06h

All 9 bits from DP

DP = 500

Instruction register (IR)

0 0 0 0 1 1 0

1 1 1 1 1 0 1 0 0

ADDC opcode

1 1 1 1 1 0 1 0 0

0 0 0 0 1 1 0

0 1 1 0 0 0 0 0

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