AN1218 datasheet(7/56 Pages) FREESCALE

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Application Note

CPU05/CPU08 Programmer's Model Comparison

AN1218 Rev. 2

Memory to memory instructions utilize four different modes available

only to the CPU08.

1. The move, immediate to direct, is a three-byte mode generally

used to initialize RAM and register values in page 0 of the memory

map. The operand in the second byte is immediately stored to the

direct page location found in the third byte.

2. The move, direct to direct, is a three-byte instruction. The operand

following the opcode is the direct page location that is stored to the

second operand direct page location.

3. The move, indexed to direct, post increment, is a two-byte

instruction. The operand addressed by the 16-bit index register

(H:X) is stored to direct page location address by the byte

following the opcode. The index register is then incremented.

4. The move, direct to indexed, post increment, is a two-byte

instruction. The operand in the direct page location addressed by

the byte following the opcode is stored in the location addressed

by the 16-bit index register (H:X). The index register is then

incremented.

In the CPU08, four instructions address operands with the index register

and then increment the index register afterwards. This is called indexed

with post increment mode. These instructions include CBEQ indexed,

CBEQ indexed with offset, MOV IX+Dir, and MOV DirIx+.

Table 2

gives examples to illustrate these different addressing modes.

Freescale Semiconductor, Inc.

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AN1218 Folha de dados(PDF) 7 Page - Freescale Semiconductor, Inc