HT56R67 datasheet(17/104 Pages) HOLTEK

17 / 104 page

HT56R67/HT56R668/HT56C668/HT56R678/HT56C678/HT56R688

Rev. 1.20

March 4, 2010

· Location 010H

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

ter 1. If a Timer/Event Counter 1 overflow occurs, the

program will jump to this location and begin execution

if the timer/event counter interrupt is enabled and the

stack is not full.

· Location 014H

This internal vector is used by the SPI/I

2C interrupt.

When either an SPI or I

2C bus, dependent upon which

one is selected, requires data transfer, the program

will jump to this location and begin execution if the

SPI/I

2C interrupt is enabled and the stack is not full.

· Location 018H

This internal vector is used by the Multi-function Inter-

rupt. The Multi-function Interrupt vector is shared by

several internal functions such as a Time Base over-

flow, a Real Time Clock overflow, an A/D converter

conversion completion, an active edge appearing on

the External Peripheral interrupt pin, a Timer/Event

Counter 2 or a Timer/Event Counter 3 overflow. The

program will jump to this location and begin execution

if the relevant interrupt is enabled and the stack is not

full.

Look-up Table

Any location within the Program Memory can be defined

as a look-up table where programmers can store fixed

data. To use the look-up table, the table pointer must

first be setup by placing the lower order address of the

look up data to be retrieved in the table pointer register,

TBLP. This register defines the lower 8-bit address of

the look-up table.

After setting up the table pointer, the table data can be

retrieved from the current Program Memory page or last

Program Memory page using the

²TABRDC[m]² or

²TABRDL [m]² instructions, respectively. When these in-

structions are executed, the lower order table byte from

the Program Memory will be transferred to the user de-

fined Data Memory register [m] as specified in the in-

struction. The higher order table data byte from the

Program Memory will be transferred to the TBLH special

byte will be read as

²0².

The following diagram illustrates the addressing/data

flow of the look-up table:

Instruction

Table Location Bits

b15

b14

b13

b12

b11

b10

TABRDC [m] PC15 PC14 PC13 PC12 PC11 PC10

PC9

PC8

TABRDL [m]

111111

Table Location

Note:

PC15~PC8: Current program counter bits

@7~@0: Table Pointer TBLP bits

For the HT56R688, the Table address location is 16 bits, i.e. from b15~b0.

For the HT56R67/HT56R678/HT56C678, the Table address location is 15 bits, i.e. from b14~b0.

For the HT56R668/HT56C668, the Table address location is 14 bits, i.e. from b13~b0.

0 1 4 H

0 0 0 H

0 0 4 H

0 0 8 H

0 0 C H

0 1 0 H

0 1 8 H

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

1 F F F H

1 6 b i t s

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 0

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

S P I / I 2 C

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

E x t e r n a l I N T 1

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 1

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

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

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

0 1 C H

7 0 0 H

7 F F H

8 0 0 H

F F F H

1 0 0 0 H

Program Memory Structure

P r o g r a m

M e m o r y

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

H i g h B y t e

T B L P

T B L H

S p e c i f i e d b y [ m ]

T a b l e C o n t e n t s H i g h B y t e

T a b l e C o n t e n t s L o w B y t e

HT56R67 Datasheet(PDF) 17 Page - Holtek Semiconductor Inc

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