参数资料
型号: ST52E430B/D
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, UVPROM, 20 MHz, MICROCONTROLLER, CDIP32
封装: WINDOWED, SHRINK, CERAMIC, DIP-32
文件页数: 8/120页
文件大小: 502K
代理商: ST52E430B/D
105/120
ST52T430/E430
SUB
Subtraction
Format:
sub dst, src
Operation:
dst dst - src
Description: The content of the RAM location specified as source is subtracted to the contents of
destination location, leaving the result in the destination.
Flags:
Z
sets if result is zero, cleared otherwise.
C
not affected.
S
sets if underflow, cleared otherwise.
Bytes:
3
Cycles:
17
Example:
if the RAM location 20 contains the value 45 and the RAM location 11 contains the value
15, then the instruction
sub 20, 11
00100111
00010100
00001011
causes the location 20 of the RAM to be loaded with the value 30.
If the location 20 contains the value 80 and the location 11 contains the value 100, the
instruction causes the location 20 to be loaded with the value 236 (256 + result) and the
S flag to be set.
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