Motorola HC12 - Manual (Page 291)

Assembler Messages
Message Codes
MCUez HC12 Assembler User’s Manual
MOTOROLA Assembler Messages 291
12.3.52 A12010: Register Expected
Type: Error
Description: A register mnemonic is missing in a post-increment,
post-decrement, pre-increment, or pre-decrement addressing
mode.
Example:
LDD 1, -ssp
Tip: Specify a register mnemonic at the specified position.
Example:
LDD 1, -sp