INSTRUCTION DESCRIPTIONS
A - 268
INSTRUCTION SET DETAILS
MOTOROLA
Operation:
Assembler Syntax:
SSH
➞
PC; SP–1
➞
SP
RTS
Description:
Pull the program counter (PC) from the system stack. The previous pro-
gram counter is lost. The status register (SR) is not affected.
Restrictions:
Due to pipelining in the program controller and the fact that the RTS
instruction accesses certain controller registers, the RTS instruction must not be immedi-
ately preceded by any of the following instructions:
Immediately before RTS
MOVEC to SSH, SSL, or SP
MOVEM to SSH, SSL, or SP
MOVEP to SSH, SSL, or SP
MOVEC from SSH
MOVEM from SSH
MOVEP from SSH
An RTS instruction cannot be the
last
instruction in a DO loop (at LA).
An RTS instruction cannot be repeated using the REP instruction.
Example:
:
RTS
;pull PC from system stack
:
Explanation of Example:
The RTS instruction pulls the 16-bit program counter (PC)
from the system stack and updates the system stack pointer (SP).
Condition Codes:
The condition codes are not affected by this instruction.
RTS
Return from Subroutine
RTS
MR
CCR
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
LF
DM
T
**
S1
S0
I1
I0
S
L
E
U
N
Z
V
C
Summary of Contents for DSP56K
Page 12: ...xii LIST of TABLES MOTOROLA List of Tables Continued Table Page Number Title Number ...
Page 13: ...MOTOROLA DSP56K FAMILY INTRODUCTION 1 1 SECTION 1 DSP56K FAMILY INTRODUCTION ...
Page 31: ...MOTOROLA DATA ARITHMETIC LOGIC UNIT 3 1 SECTION 3 DATA ARITHMETIC LOGIC UNIT ...
Page 50: ...DATA ALU SUMMARY 3 20 DATA ARITHMETIC LOGIC UNIT MOTOROLA ...
Page 51: ...MOTOROLA ADDRESS GENERATION UNIT 4 1 SECTION 4 ADDRESS GENERATION UNIT ...
Page 77: ...MOTOROLA PROGRAM CONTROL UNIT 5 1 SECTION 5 PROGRAM CONTROL UNIT ...
Page 124: ...INSTRUCTION GROUPS 6 30 INSTRUCTION SET INTRODUCTION MOTOROLA ...
Page 125: ...MOTOROLA PROCESSING STATES 7 1 SECTION 7 PROCESSING STATES STOP WAIT EXCEPTION NORMAL RESET ...
Page 167: ...STOP PROCESSING STATE MOTOROLA PROCESSING STATES 7 43 ...
Page 168: ...STOP PROCESSING STATE 7 44 PROCESSING STATES MOTOROLA ...
Page 169: ...MOTOROLA PORT A 8 1 SECTION 8 PORT A ...
Page 176: ...PORT A INTERFACE 8 8 PORT A MOTOROLA ...
Page 177: ...MOTOROLA PLL CLOCK OSCILLATOR 9 1 SECTION 9 PLL CLOCK OSCILLATOR x x d Φ VCO ...
Page 191: ...10 2 ON CHIP EMULATION OnCE MOTOROLA SECTION 10 ON CHIP EMULATION OnCE ...
Page 218: ...USING THE OnCE MOTOROLA ON CHIP EMULATION OnCE 10 29 ...
Page 604: ...INSTRUCTION ENCODING A 338 INSTRUCTION SET DETAILS MOTOROLA ...
Page 605: ...MOTOROLA BENCHMARK PROGRAMS B 1 APPENDIX B BENCHMARK PROGRAMS T T T T T P1 P3 P2 P4 T T T ...
Page 609: ...BENCHMARK PROGRAMS MOTOROLA BENCHMARK PROGRAMS B 5 ...
Page 611: ...BENCHMARK PROGRAMS MOTOROLA BENCHMARK PROGRAMS B 7 ...
Page 613: ...BENCHMARK PROGRAMS MOTOROLA BENCHMARK PROGRAMS B 9 ...
Page 615: ...BENCHMARK PROGRAMS MOTOROLA BENCHMARK PROGRAMS B 11 ...