HT86B05 datasheet(26/79 Pages) HOLTEK

26 / 79 page

HT86BXX/HT86BRXX

Rev. 1.60

October 20, 2009

If the stack is full and an enabled interrupt takes place,

the interrupt request flag will be recorded but the ac-

knowledge signal will be inhibited. When the Stack

Pointer is decremented, by RET or RETI, the interrupt

will be serviced. This feature prevents stack overflow al-

lowing the programmer to use the structure more easily.

However, when the stack is full, a CALL subroutine in-

struction can still be executed which will result in a stack

overflow. Precautions should be taken to avoid such

cases which might cause unpredictable program

branching.

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 Memory

The Program Memory is the location where the user

code or program is stored. By using the appropriate pro-

gramming tools, this Program memory device offer us-

ers the flexibility to conveniently debug and develop

their applications while also offering a means of field

programming.

Organization

The program memory stores the program instructions

that are to be executed. It also includes data, table and

interrupt entries, addressed by the Program Counter

along with the table pointer. The program memory size

is 8192

´16 bits. Certain locations in the program mem-

ory are reserved for special usage.

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 execu-

tion.

· Location 004H

This vector is used by the external interrupt. If the ex-

ternal interrupt pin on the device goes low, the pro-

gram will jump to this location and begin execution if

the external interrupt is enabled and the stack is not

full.

· Location 008H

This internal vector is used by the 8-bit Timer 0. If a

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 internal vector is used by the 8-bit Timer1. If a

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

For the HT86B40, HT86B50, HT86B50, HT86B60,

HT86BR60, HT86B70, HT86B80, HT86B90 devices,

this internal vector is used by the 16-bit Timer2. If a

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 014H

This internal vector is used by the 8-bit Timer3. If a

overflow occurs, the program will jump to this location

and begin execution if the timer interrupt is enabled

and the stack is not full.

1 F F F H

1 6 b i t s

0 1 5 H

0 0 0 H

0 0 4 H

0 0 8 H

0 0 C H

0 1 0 H

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

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 0

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

H T 8 6 B 0 5 / H T 8 6 B 1 0

H T 8 6 B R 1 0 / H T 8 6 B 2 0

H T 8 6 B 3 0 / H T 8 6 B R 3 0

0 1 4 H

T i m e r 0

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

T i m e r 1

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

T i m e r 1

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

T i m e r 2

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

T i m e r 3

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

T i m e r 3

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

H T 8 6 B 4 0 / H T 8 6 B 5 0

H T 8 6 B 6 0 / H T 8 6 B R 6 0

H T 8 6 B 7 0 / H T 8 6 B 8 0

H T 8 6 B 9 0

Program Memory Structure

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