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參數(shù)資料
| 型號： | ST6375B1/XXX |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| 封裝： | SHRINK, PLASTIC, DIP-42 |
| 文件頁數(shù)： | 74/84頁 |
| 文件大?。?/td> | 861K |
| 代理商： | ST6375B1/XXX |
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76/84
ST63E85, T85 ST63E87, T87
1.3 EPROM/OTP DESCRIPTION
The ST63E8x is the EPROM version of the
ST636x, 7x, 8x ROM products. They are intended
for use during the development of an application,
and for pre-production and small volume produc-
tion. The ST63T8x OTP have the same character-
istics. They both include EPROM memory instead
of the ROM memory of the ST638x, and so the
program and constants of the program can be eas-
ily modified by the user with the ST63E8x EPROM
programming board from SGS-THOMSON.
The ROM mask options of the ST638x for OSD
polarities (HSYNC, VSYNC, R, G, B, BLANK) are
emulated with an EPROM OPTION BYTE. This is
programmed by the EPROM programming board
and its associated software.
The EPROM Option Byte content will define the
OSD options as follows:
b7-3: Device specific bits, these reserved bits
must be programmed with “00010”.
OPT 0: This bit defines the OSD H/Vsync polarity,
if 0 the polarity will be negative if 1 the polarity will
be positive.
OPT 1: This bit defines the RGB polarity, if 0 the po-
larity will be negative if 1 the polarity will be positive.
OPT 2: This bit defines the BLANK polarity, if 0 the
polarity will be negative if 1 the polarity will be pos-
itive.
From a user point of view (with the following ex-
ceptions) the ST63E8x,T8x products have exactly
the same software and hardware features of the
ROM version. An additional mode is used to con-
figure the part for programming of the EPROM,
this is set by a +12.5V voltage applied to the
TEST/VPP
pin.
The
programming
of
the
ST63E8x,T8x is described in the User Manual of
the EPROM Programming board.
On the ST63E8x, all the 20140 bytes of PRO-
GRAM memory are available for the user, as all
the EPROM memory can be erased by exposure
to UV light. On the ST63T8x (OTP device) a re-
served area for test purposes exists, as for the
ST638x ROM device. In order to avoid any dis-
crepancy between program functionality when us-
ing the EPROM, OTP and ROM it is recommend-
ed NOT TO USE THESE RESERVED AREAS,
even when using the ST63E8x. The Table 4 on
page 10 is a summary of the EPROM/ROM Map
and its reserved area.
1.4 POWER ON RESET
This feature is not available on the ST63E8x, T8x.
It is recommended to use the following application
schematics:
Figure 4. Reset Network
This application schematics can also be used for
the ROM devices.
THE READER IS ASKED TO REFER TO THE
DATASHEET OF THE ST636x, 7x, 8x ROM-
BASED DEVICE FOR FURTHER DETAILS.
1.5 EPROM ERASING
The EPROM of the windowed package of the
ST63E8x may be erased by exposure to Ultra Vio-
let light.
The
erasure
characteristic
of
the
ST63E8x
EPROM is such that erasure begins when the
memory is exposed to light with wave lengths
shorter than approximately 4000. It should be
noted that sunlight and some types of fluorescent
lamps have wavelengths in the range 3000-
4000. It is thus recommended that the window of
the ST63E8x package be covered by an opaque
label to prevent unintentional erasure problems
when testing the application in such an environ-
ment.The recommended erasure procedure of the
ST63E8x EPROM is exposure to short wave ultra-
violet light which has wavelength 2537. The inte-
grated dose (i.e. UV intensity x exposure time) for
erasure should be a minimum of 15 W-sec/cm2.
The erasure time with this dosage is approximate-
ly 15 to 20 minutes using an ultraviolet lamp with
12000mW/cm2
power
rating.
The
ST63E8x
should be placed within 2.5cm (1 inch) of the lamp
tubes during erasure.
70
00
01
0
Opt 2
Opt 1
Opt 0
Reset Pin
VDD
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