HT45R37V datasheet(14/90 Pages) HOLTEK

14 / 90 page

HT45R37V

Rev. 1.00

October 20, 2009

· 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 Multi-function Inter-

rupt 0. The Multi-function Interrupt 0 vector is shared

by the SPI/I

2C and the C/R to F converter interrupt.

When an interrupt signal is generated, the program

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

terrupt is enabled and the stack is not full.

· Location 018H

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

rupt 1. The Multi-function Interrupt 1 vector is shared

by the Real Time Clock interrupt and Time Base inter-

rupt, A/D converter interrupt. When a interrupt signal

is generated, the program will jump to this location

and begin execution if the 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:

0 1 4 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 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 ,

R / C t o F C o n v e r t e r

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

0 0 0 H

0 0 4 H

0 0 8 H

0 0 C H

0 1 0 H

0 1 8 H

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

T i m e B a s e , R T C ,

A / D C o n v e r t e r

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

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

1 5 b i t s

F F F H

n 0 0 H

n F F H

F 0 0 H

Program Memory Structure

Instruction

Table Location Bits

b11

b10

TABRDC [m]

PC11

PC10

PC9

PC8

TABRDL [m]

1111

Table Location

Note:

PC11~PC8: Current Program Counter bits

@7~@0: Table Pointer TBLP bits

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

HT45R37V Datasheet(PDF) 14 Page - Holtek Semiconductor Inc

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