Programming timing of the HT6P20D (B0~B3=1010)

HT6P20

5

May 2, 2000

Functional Description

Programming

The HT6P20 is a one time programmable encod-

ing integrated circuit. The programmable codes

consist of 4-bit control codes and 24-bit address

codes. Before using the device, first program the

internal 4 control bits and 24 address bits. Then,

to program the address and control codes, con-

nect the PGM pin to VSS, allowing the SIO pin to

receive control and address codes from the con-

tinuously transmitting programming kit. The

control codes (B0~B3) and address timing are re-

spectively shown on the Table and the Figure for

Programming Timing. In the programming pro-

cess, the mode bit (B0) has to be programmed

first. The 0/2/4/8 data number is selected by the

address along with the data format bits (B1,B2).

The HT6P20, in addition, provides a polarity bit

(B3) to select the polarity of the output data.

Various packages of the HT6P20 offer program-

mable combinations of address/data to meet

various application needs.

Table 1: Control code

B0

Function

0

Not programmed

1

Programmed

B2

B1

Code Format

0

0

A0~A23

0

1

A0~A21 + D1~D0

1

0

A0~A19 + D3~D0

1

1

A0~A15 + D7~D0

B3

Data Output Polarity

0

Negative polarity

1

Positive polarity

The HT6P20A/D can be programmed by the

SIO pins. The HT6P20B, on the other hand, is

programmed for 2-data and positive polarity

application.

B0

B1B2

B3

P o l a ri t y c o n t ro l

A ddr es s and dat a f o r m a t

M ode c o nt r o l

OS C 2

( 3 kH z)

PG M

SI O

B0

B1B2

B3

A0

A1A2

A3

A18 A 19 A 2 0 A2 1A2 2 A 2 3

P r ogr am m i ng

P r ogr am m i ng

bi t

N o t e : ( 1) B 0 ~ B 3 a r e c o n t r o l c o d e s

( 2 ) A 0 ~ A 2 3 a r e a d d r e s s c o d e s

( 3 ) A 20 ~ A 23 s t ands f or don' t c ar e f o r t he H T 6P 20D

1

0

1

0

0

100

1

0

X

X

X

X

( 5 ) 0 : " L o w " ; 1: " H i g h " ; X : D o n ' t c a r e

1

( 4 ) S I O m u s t be s e t t o " H i gh" d u r i ng C and B 0 per i o ds

C

Programming timing for the HT6P20D