HT83F60 datasheet(9/62 Pages) HOLTEK

9 / 62 page

HT83FXX

Rev. 1.30

June 7, 2010

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.

Structure

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 2K

´15 bits. Certain locations in the program memory

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 execution.

· 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 vector is used by the 8-bit Timer 0. If a overflow

occurs, the program will jump to this location and be-

gin execution if the timer interrupt is enabled and the

stack is not full.

· Location 00CH

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

occurs, the program will jump to this location and be-

gin execution if the timer interrupt is enabled and the

stack is not full.

· Location 010H

Reserved.

· Location 014H

This vector is used by the SIM Bus interrupt service

program. If the SIM Bus interrupt resulting from a

slave address is matched or if 8 bits of data have been

received or transmitted successfully from the I

2C inter-

face, or 8 bits of data have been received or transmit-

ted successful from SPI interface, the program will

jump to this location and begin execution if the inter-

rupt is enabled and the stack is not full.

7 F F H

1 5 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

T i m e B a s e

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

T i m e r C o u n t e r 0

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

0 1 4 H

T i m e r C o u n t e r 1

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

S I M

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

Program Memory Structure

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