Z89C00 データシートの表示（PDF） - Zilog

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Z89C00

16-BIT DIGITAL SIGNAL PROCESSOR

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PRELIMINARY

Z89C00

16-BIT DIGITAL SIGNAL PROCESSOR

<memind> This mode is used for indirect, indirect accesses

to the program memory. The address of the memory is

located in a RAM location, which is specified by the value

in a pointer. So @@P1:1 tells the processor to read (write

is not possible) from a location in memory, which is

specified by a value in RAM, and the location of the RAM

is in turn specified by the value in the pointer. Note that the

data pointer can also be used for a memory access in this

manner, but only one “@” precedes the pointer. In both

cases the memory address stored in RAM is incremented

by one each time the addressing mode is used to allow

easy transfer of sequential data from program memory.

<accind> Similar to the previous mode, the address for the

program memory read is stored in the Accumulator. @A in

the second operand field loads the number in memory

specified by the address in A.

<direct> The direct mode allows read or write to data RAM

from the Accumulator by specifying the absolute address

of the RAM in the operand of the instruction. A number

between 0 and 255 indicates a location in RAM0, and a

number between 256 and 511 indicates a location in

RAM1.

<limm> This indicates a long immediate load. A 16-bit

word can be copied directly from the operand into the

specified register or memory.

<simm> This can only be used for immediate transfer of

8-bit data in the operand to the specified RAM pointer.

CONDITION CODES

The following table defines the condition codes supported

by the DSP assembler. If the instruction description

refers to the <cc> (condition code) symbol in one of its

addressing modes, the instruction will only execute if the

condition is true.

Name

C

EQ

F

IE

MI

NC

NE

NIE

NOV

NU0

Description

Carry

Equal (same as Z)

False

Interrupts Enabled

Minus

No Carry

Not Equal (same as NZ)

Not Interrupts Enabled

Not Overflow

Not User Zero

Name

NU1

NZ

OV

PL

U0

U1

UGE

ULT

Z

Description

Not User One

Not zero

Overflow

Plus (Positive)

User Zero

User One

Unsigned Greater Than or

Equal (Same as NC)

Unsigned Less Than (Same as C)

Zero

DC 4083-00

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