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eZ8

™

CPU Core

User Manual

UM012820-0810 Z8

Compatibility

Alternate Function Op Code

To accommodate the new instructions, the Op Code 1Fh refers to a new

second Op Code map. The

1Fh is prepended to an Op Code to select the

alternate functions available on the second Op Code map. The CPC,

CPCX, SRL, LDWX and PUSH (immediate) instructions use this second

Op Code map. You can employ the CPC, CPCX, SRL, LDWX and PUSH

(immediate) instructions directly when writing assembly language code.

The eZ8 CPU assembler automatically inserts the

1Fh Op Code as neces-

sary.

Moved Instructions

Some of the existing Z8 CPU instructions have been moved to new 

Op Codes in the eZ8 CPU. Table 5 lists the moved instruction.

Removed Instructions

The instruction types LD r1, R2 and LD R1, r2 are removed from the Op

Code map because they are now subsets of the LD instruction (Op Code

E4h) using Escaped mode addressing. In the Z8 CPU, these instructions

used Op Codes

08h–F8h and 09h–F9h. The assembler for the eZ8 CPU

Table 5. Instructions with New Op Codes

Instruction

eZ8 CPU

Op Code (Hex)

Z8 CPU

Op Code (Hex)

SRP 01 31

DEC R1 30 00

DEC IR1 31 01

JP IRR1 C4 30

NOP 0F FF

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 313 314

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