PS081 datasheet(111/155 Pages) AMSCO

111 / 155 page

acam-messelectronic gmbh - Friedrich-List-Str.4 - D-76297 Stutensee-Blankenloch - Germany - www.acam.de

6-8

PSØ81

6.4

Instruction Set

The complete instruction set of the PSØ81 consists of 94 core instructions that have unique op-code

decoded by the CPU. Further there are emulated instructions like no2lcd that are replaced automati-

cally by the assembler and call a subroutines in the ROM code.

The variety of the instruction set allows to write comprehensive programs that cope with the 2 K size

of the EEPROM.

6.4.1

Branch instructions

There are 3 principles of jumping within the code:

Jump. Absolute addressing with 12 Bit within the whole address space.

Branch. Relative to the actual address with 8 Bit in the range of –128 to +127 bit addresses.

Skip. Jump ahead up to 3 op-codes (3 to 15 bytes).

The assembler puts together jump and branch into goto-instructions.

It is possible to jump into subroutines only by means of absolute jumps and without any condition.

6.4.2

Arithmetic operations

The RAM is organized in 24 Bit words. All instructions are based on two’s complement operations.

An arithmetic command combines two accumulators and writes back the result into the first menti-

oned accumulator. The RAM address pointer shows the RAM address that is handled in the same

way as an accumulator. Each operation on the accumulator affects the four flags. The flags refer to

the last operation.

Table 6.4 Instruction set

Simple Arithmetic

Complex Arithmetic

Shift & Rotate

RAM access

abs

div24

clrC

clear

add

divmod

rotl

decramadr

compare

mult24

rotR

incramadr

compl

mult48

setC

move

decr

shiftL

ramadr

getflag

shiftR

swap

incr

sign

sub

Logic

Bitwise

LCD display

EEPROM access

and

bitclr

clrLCD

equal

eor

bitinv

dez2lcd

getepr

nor

bitset

newlcd

putepr

invert

no2lcd

useEprInit

nand

no2LcdAccu

nor

setLCD

spi2lcd

Member of the ams Group

PS081 Datasheet(PDF) 111 Page - ams AG

PS081 Datasheet(HTML) 111 Page - ams AG

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL