Analog Devices adsp-2100 Manual page 86

3 Program Control
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;
The stack is pushed immediately, in the same cycle.
Examples:
AX0 = TOPPCSTACK;
NOP;
TOPPCSTACK = I7;
Only the following registers may be used in the special TOPPCSTACK
instructions:
ALU, MAC,
& Shifter
Registers
AX0
AX1
MX0
MX1
AY0
AY1
MY0
MY1
AR
MR0
MR1
MR
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!
3 – 26
{push reg contents onto PC stack}
{pop PC stack into AX0}
{push contents of I7 onto PC stack}
DAG
Registers
I0 I4
I1 I5
I2 I6
I3 I7
M0 M4
M1 M5
M2 M6
M3 M7
L0 L4
L1 L5
L2 L6
L3 L7