Pushud Push User Stack (Decrementing) - Samsung S3C8275X User Manual

S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X
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