HT9580 datasheet(43/63 Pages) HOLTEK

43 / 63 page

HT9580

April 28, 2000

Preliminary

CL K

AD D R

DA T A I

DA T A O

DA T A E N

WE _ N

S Y NC,

VP B

RDY ,

RE S _ N

SO B _ N

t cy c

t ad

t ah

R D A d d r e s s

W R A ddr es s

RE A D

t di s

WR I T E

t di h

t dod

t doh

t denbd

t we d

t sy d , t vd

t sy h , t vh

t rd h , t re s h , t so h

t rd s , t re s s , t so s

M6502 read and write cycle

Accumulator

The Accumulator is a general purpose 8-bit reg-

ister which stores the results of most arithme-

tic and logic operations. In addition, the

accumulator usually contains one of the two

data words used in these operations.

Index register

There are two 8-bit Index Register (X and Y)

which may be used to count program steps or to

provide an index value to be used in generating

an effective address. When executing an in-

struction which specifies indexed addressing,

the mC fetches the opcode and the base address,

and modifies the address by adding the index

eration. Pre- or post-indexing of indirect ad-

dresses is possible.

Processor status register

The 8-bit processor status register contains

seven status flags. Some of the flags are con-

trolled by the program, others may be con-

trolled both by the program and the mC. The

HT9580 instruction set contains a number of

conditional branch instructions which are de-

signed to allow testing of these flags.

Program counter

The 16-bit program counter register provides

the addresses which step the mC through se-

quential program instructions. Each time the

HT9580 fetches an instruction from the pro-

gram memory, the lower byte of the program

counter (PCL) is placed on the low-order bits of

the address bus and the higher byte of the pro-

gram counter (PCH) is placed on the high-order

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