Specifications

CPU Description
Enhanced and Unique Instructions
The V20 implements all of the 8088/8086 instructions. It also has a
list of enhanced instructions as well as instructions unique to the V20.
The enhanced instructions include:
• stack manipulation
• shift by immediate value
• move string instructions
The unique instructions include:
• packed BCD
• bit field manipulation
• repeat until carry flag clears or sets
• mode operations
• additional floating point processor call instructions
Only the mode operation instructions are discussed here. For a
complete listing and description of these instructions, refer to the NEC
Microcomputer Products Data Book, Volume 2 of 2, 1987.
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