Pushud Push User Stack (Decrementing) - Samsung S3C80A5B User Manual

S3C80A5B
PUSHUD
— Push User Stack (Decrementing)
PUSHUD dst,src
IR ← IR – 1
Operation:
dst ← src
This instruction is used to address user-defined stacks in the register file. PUSHUD decrements the
user stack pointer and loads the contents of the source into the register addressed by the
decremented stack pointer.
Flags: No flags are affected.
Format:
opc
Example: Given: Register 00H = 03H, register 01H = 05H, and register 02H = 1AH:
PUSHUD @00H,01H
If the user stack pointer (register 00H, for example) contains the value 03H, the statement
"PUSHUD @00H,01H" decrements the user stack pointer by one, leaving the value 02H. The 01H
register value, 05H, is then loaded into the register addressed by the decremented user stack
pointer.
dst src
→
Register 00H = 02H, register 01H = 05H, register 02H = 05H
Bytes Cycles Opcode
3 8
INSTRUCTION SET
Addr Mode
(Hex) dst src
82 IR R
6-67