The OKI OLMS-40 series of microprocessors has a unique in- struction set in which all registers and addressing are inherent to the individual instructions. Thus there is no explicit register set nor any addressing modes. The internal 4-bit registers are the Accumulator (A), and registers W, X, Y, and Z. The 8-bit memory pointer DP is accessible by lower nibble as DPL and upper nibble DPH.
MICROPROCESSOR SELECTION
The selection of one of the four OLMS-40 supported micropro-
cessor types is achieved by adding one of these directives at
the beginning of the assembly source file:
.msm5840 MSM5840 Microprocessor
.msm5842 MSM5842 Microprocessor
.msm58421 MSM58421 Microprocessor
.msm58422 MSM58422 Microprocessor
MSM58421 and MSM58422 have identical cores with differing peri-
pherals.
The variable .__.CPU. generated by the assembler will indi-
cated the microprocessor selection with the value of 0
(MSM5840), 1 (MSM5842), 2 (MSM58421), or 3 (MSM58422).
OLMS-40 INSTRUCTION SET
The instruction set can be broken up into several categories
with common traits.
Load, Store, Read, and Clear
CLA Clear Accumulator
CLL Clear DPL
CLH Clear DPH
LAI #4-bit Load Accumulator with Immediate
LLI #4-bit Load DPL with Immediate
%LHI #1-bit Load DPH with Immediate
LHI #3-bit Load DPH with Immediate
L Load Accumulator with Memory
*LM #2-bit Load Accumulator with Memory
then Modify DPH
LAL Load Accumulator wit DPL
LLA Load DPL with Accumulator
LAW Load Accumulator with W Register
*LAX Load Accumulator with X Register
*LAY Load Accumulator with Y Register
*LAZ Load Accumulator with Z Register
SI Save Accumulator to Memory
then increment DPL
*SMI #2-bit Save Accumulator to Memory
then Modify DPH and increment DPL
LWA Load W Register with Accumulator
*LXA Load X Register with Accumulator
*LYA Load Y Register with Accumulator
*LZA Load Z Register with Accumulator
LPA Load Port Pointer with Accumulator
$%LTI Load Timer with All Zeros
*LTI #8-bit Load Timer with Immediate
*RTH Read Timer H
*RTL Read Timer L
* - MSM5840 Specific Instruction
% - MSM5842 Specific Instruction
$ - MSM58421 and MSM58422 Specific Instruction
Exchange
Several 'SAVE REGISTERS', A, AX, L and CH, facilitate tem-
porary register storage:
*XA Exchange Accumulator with Save Register A
*XAX Exchange Accumulator with Save Register AX
*XL Exchange DPL with Save Register L
*XCH Exchange DPH and Carry with Save Register CH
X Exchange Accumulator with Memory
*XM #2-bit Exchange Accumulator with Memory
then Modify DPH
* - MSM5840 Specific Instruction
Increment
$%INA Increment Accumulator
$%INL Increment DPL
$%INM Increment Memory
$%INW Increment W Register
*INA Increment Accumulator - Skip If Zero
*INL Increment DPL - Skip If Zero
*INM Increment Memory - Skip If Zero
*INW Increment W Register - Skip If Zero
*INX Increment X Register - Skip If Zero
*INY Increment Y Register - Skip If Zero
*INZ Increment Z Register - Skip If Zero
* - MSM5840 Specific Instruction
% - MSM5842 Specific Instruction
$ - MSM58421 and MSM58422 Specific Instruction
Decrement
$%DCA Decrement Accumulator
$%DCL Decrement DPL
$%DCM Decrement Memory
*DCA Decrement Accumulator - Skip If Zero
*DCL Decrement DPL - Skip If Zero
*DCM Decrement Memory - Skip If Zero
*DCW Decrement W Register - Skip If Zero
*DCX Decrement X Register - Skip If Zero
*DCY Decrement Y Register - Skip If Zero
*DCZ Decrement Z Register - Skip If Zero
*DCH Decrement DPH - Skip if all 1's and C=0
* - MSM5840 Specific Instruction
% - MSM5842 Specific Instruction
$ - MSM58421 and MSM58422 Specific Instruction
Logical
CAO Complement Accumulator of One
*AND And Accumulator with Memory
*OR Or Accumulator with Memory
*EOR Exclusive Or Accumulator with Memory
RAL Rotate Accumulator Left Through Carry
* - MSM5840 Specific Instruction
Arithmetic
AC Add Memory to Accumulator with Carry
*ACS Add Memory to Accumulator with Carry,
Skip if Carry
AS Add Memory to Accumulator,
Skip if Carry
AIS #4-bit Add Immediate to Accumulator,
Skip if Carry
DAS Decimal adjust Accumulator
in Subtraction
$CM Compare Accumulator with Memory
%*CM Compare Accumulator with Memory,
Skip if Equal
*AWS Add W Register to Accumulator,
Skip if Carry
*AXS Add X Register to Accumulator,
Skip if Carry
*AYS Add Y Register to Accumulator,
Skip if Carry
*AZS Add Z Register to Accumulator,
Skip if Carry
* - MSM5840 Specific Instruction
% - MSM5842 Specific Instruction
$ - MSM58421 and MSM58422 Specific Instruction
Bit Set, Reset, and Test
*SPB #2-bit Set Port Bit
*RPB #2-bit Reset Port Bit
SMB #2-bit Set Memory Bit
RMB #2-bit Rest Memory Bit
$%TAB #2-bit Test Acumulator Bit
$%TMB #2-bit Test Memory Bit
$THB Test H Port Bit
$%TTM Test Timer Flag
$%TC Test Carry Flag
*TAB #2-bit Test Acumulator Bit, Skip if One
*TMB #2-bit Test Memory Bit, Skip if One
*TKB #2-bit Test K Port Bit, Skip if One
%*THB #1-bit Test H Port Bit, Skip if One
*TI Test Interrupt Flag, Skip if One
*TTM Test Timer Flag, Skip if One
*TC Test Carry Flag, Skip if One
SC Set Carry Flag
RC Reset Carry Flag
* - MSM5840 Specific Instruction
% - MSM5842 Specific Instruction
$ - MSM58421 and MSM58422 Specific Instruction
Branch and Subroutine
%J 10-bit Jump
$*J 11-bit Jump
JC 6-bit Jump in Current Page
JA Jump with Accumulator
%CAL 10-bit Call Subroutine
$*CAL 11-bit Call Subroutine
RT Return from Subroutine
* - MSM5840 Specific Instruction
% - MSM5842 Specific Instruction
$ - MSM58421 and MSM58422 Specific Instruction
Input and Output
*OBS Output Byte String
OTD Output Table Data
OA Output Accumulator to Port A
OB Output Accumulator to Port B
OP Output Accumulator to Port P
designated Port Pointer
*OAB Output Memory and Accumulator
to Ports a and b
OPM Output Memory to Port P
designated Port Pointer
IA Input Port A into Accumulator
IB Input Port B into Accumulator
IK Input Port K into Accumulator
*IAB Input Ports A and B
into Memory and Accumulator
* - MSM5840 Specific Instruction
Control
*EI Enable Interrupt
*DI Disable Interrupt
*ET Enable Timer
*DT Disable Timer
*ECT Enable Counter
*DCT Disable Counter
*HLT Halt
*EXP Exchange Program
NOP No Operation
* - MSM5840 Specific Instruction
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