HT45FM03B データシートの表示（PDF） - Holtek Semiconductor

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HT45FM03B

Brushless DC Motor Flash Type 8-Bit MCU

Holtek Semiconductor 

HT45FM03B

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

Flash Program Memory

The Program Memory is the location where the user

code or program is stored. This device is supplied with

Flash type program memory where users can program

their application code into the device. By using the ap-

propriate programming tools, Flash type devices offer

users the flexibility to freely develop their applications,

which may be useful during debug or for products re-

quiring frequent upgrades or program changes. Flash

type devices are also applicable for use in applications

that require low or medium volume production runs.

Structure

The Program Memory has a capacity of 4K by 15 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 use by the device re-

set for program initialisation. After a device reset is ini-

tiated, the program will jump to this location and begin

execution.

· Location 004H

This vector is used by the Analog Comparator inter-

rupt. If an Analog Comparator interrupt, resulting from

a falling edge on the Analog Comparator output oc-

curs, the program will jump to this location and begin

execution if the Analog Comparator interrupt 0 is en-

abled and the stack is not full.

· Location 008H

This vector is used by the external interrupt 0. If the

INT0A, INT0B or INT0C external interrupt pins on the

device receives an edge transition, the program will

jump to this location and begin execution if the exter-

nal interrupt 0 is enabled and the stack is not full.

· Location 00CH

This vector is used by the multi-function interrupt. If

the external interrupt 1 pin on the device receives an

edge transition, or when an A/D conversion cycle is

complete, the program will jump to this location and

begin execution if the multi-function interrupt is en-

abled and the stack is not full. The external interrupt 1

active edge transition type, whether high to low, low to

high or both, is specified in the Configuration Options.

· Location 010H

This vector is used by the PWM interrupt. If a PWM in-

terrupt, resulting from a PWMxH is from inactive to

active, the program will jump to this location and begin

execution if the PWM interrupt is enabled and the

stack is not full.

· Location 014H

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

ter 0. If the 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 018H

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

ter 1. If the 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.

000H

D e v ic e In itia liz a tio n P r o g r a m

004H

A n a lo g C o m p a r a to r In te r r u p t

008H

E x te rn a l In te rru p t 0

00C H

M u lti- fu n c tio n In te r r u p t

010H

P W M In te rru p t

014H

T im e r /E v e n t C o u n te r 0 O v e r flo w

018H

T im e r /E v e n t C o u n te r 1 O v e r flo w

n00H

L o o k - u p T a b le

nFFH

F00H

L o o k - u p T a b le ( L a s t P a g e )

FFFH

( 4 K x 1 5 B its )

Program Memory Structure

Rev. 1.10

12

May 7, 2010

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