HT82K76E-L datasheet(8/58 Pages) HOLTEK

8 / 58 page

HT82K70E-L/HT82K76E-L

Rev. 1.00

September 15, 2009

Arithmetic and Logic Unit

- ALU

The arithmetic-logic unit or ALU is a critical area of the

microcontroller that carries out arithmetic and logic op-

erations of the instruction set. Connected to the main

microcontroller data bus, the ALU receives related in-

struction codes and performs the required arithmetic or

logical operations after which the result will be placed in

the specified register. As these ALU calculation or oper-

ations may result in carry, borrow or other status

changes, the status register will be correspondingly up-

dated to reflect these changes. The ALU supports the

following functions:

· Arithmetic operations: ADD, ADDM, ADC, ADCM,

SUB, SUBM, SBC, SBCM, DAA

· Logic operations: AND, OR, XOR, ANDM, ORM,

XORM, CPL, CPLA

· Rotation RRA, RR, RRCA, RRC, RLA, RL, RLCA,

RLC

· Increment and Decrement INCA, INC, DECA, DEC

· Branch decision, JMP, SZ, SZA, SNZ, SIZ, SDZ,

SIZA, SDZA, CALL, RET, RETI

Program Memorys

The Program Memory is the location where the user

code or program is stored. The device is a One-Time

Programmable, OTP, memory type device where users

can program their application code into the device. By

using the appropriate programming tools, OTP devices

offer users the flexibility to freely develop their applica-

tions which may be useful during debug or for products

requiring frequent upgrades or program changes. OTP

devices are also applicable for use in applications that

require low or medium volume production runs. The de-

vice is a Mask memory type device and offers the most

cost effective solution for high volume products.

Structure

The Program Memory has a capacity of 4K by 16 or 8K

by 16 bits. The Program Memory is addressed by the

Program Counter and also contains data, table informa-

tion and interrupt entries. Table data, which can be

setup in any location within the Program Memory, is ad-

dressed by separate table pointer registers.

Special Vectors

Within the Program Memory, certain locations are re-

served for special usage such as reset and interrupts.

· Location 000H

This vector is reserved for use by the device reset for

program initialisation. After a device reset is initiated, the

program will jump to this location and begin execution.

· Location 004H

This vector is used by the external interrupt. If the INT

external input pin on the device receives a high to low

transition, the program will jump to this location and

begin execution, if the interrupt is enabled and the

stack is not full.

· Location 008H

This vector is used by the timer0 counter. If a counter

overflow occurs, the program will jump to this location

and begin execution if the timer interrupt is enabled

and the stack is not full.

· Location 00CH

This vector is used by the timer1 counter. If a counter

overflow occurs, the program will jump to this location

and begin execution if the timer interrupt is enabled

and the stack is not full.

· Location 010H

This vector is used by serial interface . When 8-bits of

data have been received or transmitted successfully

from serial interface, the program will jump to this lo-

cation and begin execution if the interrupt is enabled

and the stack is not full.

· Table location

Any location in the program memory can be used as

look-up tables. There are three method to read the

ROM data by two table read instructions:

²TABRDC²

and

²TABRDL², transfer the contents of the lower-or-

der byte to the specified data memory, and the

higher-order byte to TBLH. The three methods are

shown as follows:

¨ The instructions

²TABRDC [m]² (the current page,

one page=256words), where the table locations is

defined by TBLP in the current page. And the

configuration option TBHP is disabled (default).

¨ The instructions

²TABRDC [m]², where the table lo-

cations is defined by registers TBLP (07H) and

TBHP (01FH). And the configuration option TBHP

is enabled.

¨ The instructions

²TABRDL [m]², where the table lo-

cations is defined by registers TBLP (07H) in the

last page (0F00H ~ 0FFFH or 1F00H~1FFFH).

0 F F F H

1 6 b i t s

I n i t i a l i s a t i o n

V e c t o r

E x t e r n a l

I n t e r r u p t V e c t o r

T i m e r / E v e n t C o u n t e r 0

I n t e r r u p t V e c t o r

T i m e r / E v e n t C o u n t e r 1

I n t e r r u p t V e c t o r

0 0 0 H

0 0 4 H

0 0 8 H

0 0 C H

0 1 0 H

S P I

I n t e r r u p t V e c t o r

1 F F F H

1 6 b i t s

I n i t i a l i s a t i o n

V e c t o r

E x t e r n a l

I n t e r r u p t V e c t o r

T i m e r / E v e n t C o u n t e r 0

I n t e r r u p t V e c t o r

T i m e r / E v e n t C o u n t e r 1

I n t e r r u p t V e c t o r

0 0 0 H

0 0 4 H

0 0 8 H

0 0 C H

0 1 0 H

S P I

I n t e r r u p t V e c t o r

H T 8 2 K 7 0 E - L

H T 8 2 K 7 6 E - L

Program Memory Structure

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