HT48F06E datasheet(9/69 Pages) HOLTEK

9 / 69 page

HT48F06E/HT48F10E/HT48F30E

Rev. 1.00

September 10, 2007

Note:

1. For the HT48F06E, N=2, i.e. 2 levels of stack

available.

2. For the HT48F10E and HT48F30E, N=4,

i.e. 4 levels of stack available.

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. For these devices the Pro-

gram Memory is a Flash type, which means it can be

programmed and reprogrammed a large number of

times, allowing the user the convenience of code modifi-

cation using the same device. By using the appropriate

programming tools, these devices offer users the flexi-

bility to conveniently debug and develop their applica-

tions while also offering a means of field programming.

Organization

The Program Memory has a capacity of 1K by 14 or 2K

by 14 bits depending upon which device is selected. 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.

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 3

S t a c k L e v e l 4

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

3 F F H

N o t I m p l e m e n t e d

1 4 b i t s

0 1 8 H

0 0 0 H

0 0 4 H

0 0 8 H

0 0 C H

0 1 0 H

7 F F H

4 0 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

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

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 / E v e n t C o u n t e r

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

H T 4 8 F 3 0 E

H T 4 8 F 0 6 E

H T 4 8 F 1 0 E

0 1 4 H

Program Memory Structure

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