Program Control3
3 – 26
There is no standard PUSH PC stack instruction. To push a specific value
onto the PC stack, therefore, use the following special instruction:
TOPPCSTACK = reg; {push reg contents onto PC stack}
The stack is pushed immediately, in the same cycle.
Examples:
AX0 = TOPPCSTACK; {pop PC stack into AX0}
NOP;
TOPPCSTACK = I7; {push contents of I7 onto PC stack}
Only the following registers may be used in the special TOPPCSTACK
instructions:
ALU, MAC,
& Shifter DAG
Registers Registers
AX0 I0 I4
AX1 I1 I5
MX0 I2 I6
MX1 I3 I7
AY0 M0 M4
AY1 M1 M5
MY0 M2 M6
MY1 M3 M7
AR L0 L4
MR0 L1 L5
MR1 L2 L6
MR L3 L7
SI
SE
SR0
SR1
The Type 17 Register Move instruction is described in Chapter 15,
Instruction Set Reference. Note that TOPPCSTACK may not be used as a
register in any other instruction type!
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