参数资料
型号: 780024
厂商: NEC Corp.
英文描述: Common to 78K/0 Series
中文描述: 共同的78K / 0系列
文件页数: 72/129页
文件大小: 644K
代理商: 780024
72
CHAPTER 5 EXPLANATION OF INSTRUCTIONS
User's Manual U12326EJ4V0UM
Decrement
DEC
Byte Data Decrement
[Instruction format]
DEC dst
[Operation]
dst
dst
1
[Operand]
Mnemonic
Operand(dst)
DEC
r
saddr
[Flag]
Z
AC
CY
×
×
[Description]
The destination operand (dst) contents are decremented by only one.
If the decrement result is 0, the Z flag is set (1). In all other cases, the Z flag is cleared (0).
If the decrement generates a carry for bit 3 out of bit 4, the AC flag is set (1). In all other cases, the AC
flag is cleared (0).
Because this instruction is frequently used for decrement of a counter for repeated operations and an indexed
addressing offset register, the CY flag contents are not changed (to hold the CY flag contents in multiple-
byte operation).
If dst is the B or C register or saddr, and it is not desired to change the AC and CY flag contents, the DBNZ
instruction can be used.
[Description example]
DEC FE92H;
The contents at address FE92H are decremented.
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相关代理商/技术参数
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78002415 制造商:Laird Technologies Inc 功能描述:SLMT 2F ZNC USFT
78002417 制造商:Laird Technologies Inc 功能描述:SLMT 2F SNB USFT
78002419 制造商:Laird Technologies Inc 功能描述:SLMT 2F NIB USFT
78002-49-59 制造商:VERNITRON - USE MOL 功能描述:Cross Referenced to MOLEX - Part: MOL38789-0016
780024Y 制造商:NEC 制造商全称:NEC 功能描述:Common to 78K/0 Series