Cypress PSoC DESIGNER ImageCraft M8C, Manual

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52 ImageCraft Assembly Language Guide, Document # 001-44475 Rev. *B
M8C Instruction Set
4.15 Jump JMP
Jump, unconditionally, to the address indicated by the sum of the argument and the current
PC+1
.
The current PC value is defined as the PC value that corresponds to the ROM address of the first
byte of the
JMP
instruction.
The
JMP
instruction uses a two-byte instruction format where the lower nibble of the first byte is used
for the upper 4 bits of the 12-bit relative address. This causes an effective 4-bit opcode. Therefore,
the following are all valid opcode bytes for the
JMP
instruction: 0x80, 0x81, 0x82,..., 0x8F.
Instructions
Operation Opcode Cycles Bytes
Mnemonic Argument
JMP expr 0x8x 5 2
Conditional
Flags: CF
ZF Unaffected.
Unaffected.
Example:
0000 _main:
0000 80 01 [05] jmp SubFun
Jump is forward, relative to
PC
, therefore offset is positive (
0x01
).
0002 SubFun:
0002 8F FD [05] jmp _main
Jump is backwards, relative to
PC
, therefore, offset is negative (
0xFD
).
PC PC 1 +
 
k +

, 2048 – k 2047
   
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