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AN1218 Datasheet(PDF) 10 Page - Freescale Semiconductor, Inc |
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AN1218 Datasheet(HTML) 10 Page - Freescale Semiconductor, Inc |
10 / 56 page Application Note AN1218 Rev. 2 10 Index Registers CPU08 has the additional H index register which is the high byte extension to the X index register. Together, the two index registers formulate the concatenated 16-bit H:X index register. Five new instructions are introduced on the CPU08 to allow manipulation of the H:X index register. Source code written for the HC05 will not effect the H register and it will remain in its reset state of $00. The TSX and the TXS instructions also utilize the H:X index register. These instructions are covered in more detail in the stack pointer section. Five New Indexing Instructions, Detail The new CPU08 instructions that affect the index registers are listed below. Examples for these instructions are given in AppendixA—New CPU08 Indexing Instruction Examples . AIX Add Immediate to Index Register Operation: X ← (H:X) + (M) Description: AIX adds an immediate value to the 16-bit index register formed by the concatenation of the H and X registers. The immediate operand is an 8-bit two's complement signed offset. Prior to addition to H:X, the offset is sign extended to 16 bits. CLRH Clear Index High Operation: H ← $00 Description: The contents of H are replaced with zeros. CPHX Compare 16-bit Index Register Operation: (H:X) – (M:M+1) Description: CPHX compares the 16-bit index register H:X with the 16-bit value in memory and sets the condition code register accordingly. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
Similar Part No. - AN1218 |
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