HT827A0 データシートの表示（PDF） - Holtek Semiconductor

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HT827A0

8-Bit Microcontroller with Voice ROM

Holtek Semiconductor 

00H

In d ir e c t A d d r e s s in g R e g is te r

01H

MP

02H

03H

04H

05H

ACC

06H

PCL

07H

TB LP

08H

TB LH

09H

W D TS

0A H

STATU S

0B H

IN T C

0C H

0D H

0E H

0FH

TM R H

10H

TM R L

11H

TM R C

12H

PA

13H

PAC

14H

PB

15H

PBC

16H

PC

17H

PCC

18H

PD

19H

PDC

1A H

PE

1B H

PEC

1C H

1D H

1E H

1FH

20H

DAL

21H

DAH

22H

VCR

23H

SRC

24H

25H

26H

27H

28H

BEAT

29H

TEM PO

2A H

TO N E

2B H

2C H

ROM C

2D H

2E H

2FH

30H

G e n e ra l P u rp o s e

D ATA M EM O R Y

S p e c ia l P u r p o s e

D ATA M EM O R Y

:U nused

R e a d a s "0 0 "

FFH

RAM mapping

HT827A0

control registers (PAC; 13H, PBC; 15H, PCC;

17H, PDC; 19H, PEC; 1BH). The 20H to 2FH

are used for sound and tone (melody) synthesis.

The function registers include a lower-order

byte register (DAL; 20H) of D/A data,

higher-order byte register (DAH;21H) of D/A

data , volume control register (VCR; 22H), sam-

pling rate control register (SRC; 23H), beat con-

trol register (BEAT; 28H), tempo control

register (TEMPO; 29H), tone control register

(TONE; 2AH) and voice ROM control register

(ROMC; 2CH). The remaining space before 30H

is reserved for future expansion. Reading these

remaining locations will get ²00H². The general

purpose data memory is used for data and con-

trol information under instruction commands.

All of the areas of data memory can handle

arithmetic, logic, increment, decrement and ro-

tate operations directly. Except for some dedi-

cated bits, each bit in the data memory can be

set and reset by ²SET [m].i² and ²CLR [m].i²,

and can also be indirectly accessed through a

memory pointer register (MP; 01H).

Indirect addressing register

Location 00H is an indirect addressing register

that is not physically implemented. Any

read/write operation of [00H] accesses the data

memory pointed to by MP (01H). Indirectly read-

ing location 00H will return the result to 00H

whereas, indirectly writing it will have no effect.

Arithmetic and logic unit - ALU

This circuit performs 8-bit arithmetic and logic

operations. ALU provides the following func-

tions:

· Arithmetic operations (ADD, ADC, SUB,

SBC, DAA)

· Logic operations (AND, OR, XOR, CPL)

· Rotation (RL, RR, RLC, RRC)

· Increment & decrement (INC, DEC)

· Branch decision (SZ, SNZ, SIZ, SDZ ....)

ALU not only saves the results of a data opera-

tion but also change the status register.

11

March 15, 2000

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