AT75C datasheet(32/171 Pages) ATMEL

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AT75C DSP Subsystem

1368C–INTAP–08/02

Data and Program Operands

Table 3 lists the data and the program operands: number of bits, operand range includ-

ing the assembler mnemonics and an example for each operand. See also “Memory

Addressing Modes” on page 21.

Negative numbers can also be written as four hexadecimal digits. For example: -0x80

can be written as 0xFF80; -0x20 can be written as 0xFFe0.

Table 3. Data Operands

Data Operand

Bit Count

Assembler Syntax

Example

Decimal

Hexadecimal

Binary

#signed short

immediate

2’s complement 8 bits

#-128..127

#-0x80..0x7F

#-0b100000000..

0b01111111

mov #-12, r0

#signed 6-bit

immediate

2’s complement 6 bits

#-32..31

#-0x20..0x1F

#-0b100000..

0b011111

shfi b0, a0, #-4

#signed 5-bit

immediate

2’s complement 5 bits

#-16..15

#-0x10..0x0F

#0b10000..

0b01111

movsi r1, a0, #3

#unsigned 9-bit

immediate

unsigned 9 bits

#0..511

#0x000..0x1FF

#0b000000000..

0b111111111

load #270, modi

#unsigned short

immediate

unsigned 8 bits

#0..255

#0x00..0xFF

#0b00000000..

0b11111111

add #0b10, a0

#unsigned 7-bit

immediate

unsigned 7 bits

#0..127

#0x00..0x7F

#0b0000000..

0b1111111

load #3, stepj

#unsigned 5-bit

immediate

unsigned 5 bits

#0..31

#0x00..0x1F

#0b00000..

0b11111

mov #0x5, icr

#unsigned 2-bit

immediate

unsigned 2 bits

#0..3

#0x0..0x3

#0b00..0b11

load #0b11, ps

#bit number

unsigned 4 bits

#0..15

#0x0..0xF

#0b0000..0b1111

tstb r0, #12

##long immediate,

##offset

2’s complement 16 bits

##-32768..32767

##0x8000..0x7FFF

mov ##-0x9000,

unsigned 16 bits

##0..65535

##0x0000..0xFFFF

mov ##0xF000,

offset7

2’s complement 7 bits

-64..63

-0x40..0x3F

-0b1000000..

0b0111111

add (rb-5), a1

Table 4. Program Operands

Program Operand

Bit Count

Assembler Syntax

Example

Decimal

Hexadecimal

Binary

direct address

unsigned 8 bits

#0..255

#-0x00..0xFF

#0b00000000..

0b11111111

add 120, a1

address

unsigned 16 bits

#0..65535

#-0x0000..0xFFFF

call 0x5000

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