Z8932320FSC datasheet(49/60 Pages) ZILOG

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Z89223/273/323/373

ZiLOG

16-Bit Digital Signal Processors with A/D Converter

DS000202-DSP0599

INSTRUCTION SET

The addressing modes are:

<pregs>, <hwregs>.

These modes are used for loads to

and from registers within the chip, such as loading to the

accumulator, or loading from a pointer register. The names

of the registers are specified in the operand field (destination

first, then source).

<dregs>.

This mode is used for access to the lower 16 ad-

dresses in each bank of RAM. The 4-bit address comes from

2 bits of the status register and 2 bits of the operand field

of the data pointer. Data registers can be used to access data

in RAM, but typically are used as pointers to access data

from the program memory.

<accind>.

Similar to the previous mode, the address for the

program memory read is stored in the Accumulator. Hence,

@A in the second operand field loads the number in mem-

ory 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 be-

tween 0 and 255 indicates a location in RAM bank 0, and

a number between 256 and 511 indicates a location in RAM

bank 1.

<limm>.

This address mode indicates a long immediate op-

erand. A 16-bit word can be loaded directly from the oper-

and into the specified register or memory location.

<simm>.

This address mode indicates a short immediate

operand. It is used to load 8-bit data into the specified RAM

pointer.

<regind>.

This mode is used for indirect access to the data

RAM. The address of the RAM location is stored in the

pointer. The “@” symbol indicates “indirect” and precedes

the pointer. For example, @P1:1 refers to the location in

RAM bank 1 specified by the value in the pointer.

<memind>.

This mode is used for indirect access to the

program memory. The address of the memory is located in

a RAM location, which is specified by the value in a pointer.

Therefore, @@P1:1 instructs the processor to read 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: the data pointer can also be used for a memory access in

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

both cases, each time the addressing mode is used, the

memory address stored in RAM is incremented by one

to allow easy transfer of sequential data from program

memory.

Table 24. Instruction Set Addressing Modes

Symbolic Name

Syntax

Description

<pregs>

Pn:b

Pointer Registers

<dregs> (points to RAM)

Dn:b

Data Registers

X, Y, PC, SR, P, EDn, A, BUS Hardware Registers

<accind> (points to Program

Memory)

Accumulator Memory Indirect

Direct Address Expression

<limm>

#<const exp>

Long (16-bit) Immediate Value

<simm>

#<const exp>

Short (8-bit) Immediate Value

<regind> (points to RAM)

@Pn:b

Pointer Register Indirect

@Pn:b+

Pointer Register Indirect with Increment

@Pn:b–LOOP

Pointer Register Indirect with Loop

Decrement

@Pn:b+LOOP

Pointer register Indirect with Loop Increment

<memind> (points to Program

Memory)

@@Pn:b

Pointer Register Memory Indirect

@Dn:b

Data Register Memory Indirect

@@Pn:b–LOOP

Pointer Register Memory Indirect with Loop

Decrement

@@Pn:b+LOOP

Pointer Register Memory Indirect with Loop

Increment

@@Pn:b+

Pointer Register Memory Indirect with

Increment

Z8932320FSC Datasheet(PDF) 49 Page - Zilog, Inc.

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