HT95R34 datasheet(10/59 Pages) HOLTEK

10 / 59 page

HT95R34

Rev. 1.10

February 18, 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 Memory

The Program Memory is the location where the user

code or program is stored. For these devices the Pro-

gram Memory is an OTP type, which means it can be

programmed once.

Structure

The Program Memory has a capacity of 8K by 16 bits.

The Program Memory is addressed by the Program

Counter and also contains data, table information and

interrupt entries. Table data, which can be setup in any

location within the Program Memory, is addressed by a

separate table pointer register.

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 internal vector is used by the Timer/Event Coun-

ter 0. If a counter overflow occurs, the program will

jump to this location and begin execution if the

timer/event counter 0 interrupt is enabled and the

stack is not full.

· Location 00CH

This internal vector is used by the Timer/Event Coun-

ter 1. If a counter overflow occurs, the program will

jump to this location and begin execution if the

timer/event counter 1 interrupt is enabled and the

stack is not full.

· Location 010H

This internal vector is used by the DTMF receiver.

When the DTMF receiver is enabled, if the DTMF re-

ceiver detects a valid character available, the program

will jump to this location and begin execution if the pe-

ripheral interrupt is enabled and the stack is not full.

· Location 014H

This location is used by the RTC. When the RTC is en-

abled and a time-out occurs, the program will jump to

this location and begin execution if the RTC interrupt

is enabled and the stack is not full.

· Location 018H

This location is used by the Multi-function Interrupt. If

a falling edge transition is detected on PC0 or PC5, or

a rising edge transition detected on PC7, the program

will jump to this location and begin execution if the

multi-function interrupt is enabled and the stack is not

full.

P r o g r a m C o u n t e r

S t a c k L e v e l 1

S t a c k L e v e l 2

S t a c k L e v e l 8

P r o g r a m

M e m o r y

S t a c k

P o i n t e r

0 0 0 H

0 0 4 H

0 0 8 H

0 0 C H

0 1 0 H

1 6 b i t s

0 1 8 H

1 F F F H

0 1 4 H

D e v i c e I n i t i a l i z a t i o n P r o g r a m

E x t e r n a l I n t e r r u p t S u b r o u t i n e

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 S u b r o u t i n e

R T C I n t e r r u p t S u b r o u t i n e

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 S u b r o u t i n e

P e r i p h e r a l I n t e r r u p t

S u b r o u t i n e

M u l t i - F u n c t i o n

I n t e r r u p t S u b r o u t i n e

Program Memory Structure

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