Computer Hardware User's Guide

PUSH PUSH Integer
13-196
Syntax PUSH src
Operation src → *++SP
Operands src register (R n , 0 ≤ n ≤ 27)
Opcode
31 24 23 16 8 7 015
000 01 1
1 01
src 0
0
1
0000000000000000
Description The contents of the src register (32 LSBs) are pushed on the current system
stack. The src is assumed to be a signed integer. The PUSH is performed with
a preincrement of the stack pointer. The integer or mantissa portion of an ex-
tended-precision register (R7–R0) is saved with this instruction.
Cycles 1
Status Bits LUF Unaffected
LV Unaffected
UF Unaffected
N Unaffected
Z Unaffected
V Unaffected
C Unaffected
OVM Operation is not affected by OVM bit value.
Example PUSH R6
Before Instruction After Instruction
R6 02 5C12 8081 R6 02 5C12 8081
SP 8098AE SP 8098AF
LUF 0 LUF 0
LV 0 LV 0
UF 0 UF 0
N 0 N 0
Z 0 Z 0
V 0 V 0
C 0 C 0
Data memory
8098AFh 0 8098AFh 5C128081
633,415,688
1,544,716,417
–62,044
633,415,688
Mode Bit