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參數資料
| 型號： | HD404888 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Low-Voltage AS Microcomputers with On-Chip LCD Circuit(片上LCD電路的低壓微計算機) |
| 中文描述： | 低電壓如同在微機芯片LCD電路（片上液晶顯示器電路的低壓微計算機） |
| 文件頁數： | 151/200頁 |
| 文件大?。?/td> | 633K |
| 代理商： | HD404888 |
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HD404889/HD404899/HD404878/HD404868 Series
151
ZTAT
TM
Microcomputer with Built-in Programmable ROM
1. Precautions for use of ZTAT
TM
microcomputer with built-in programmable ROM
(1) Precautions for writing to programmable ROM built in ZTAT
TM
microcomputer
In the ZTAT
TM
microcomputer with built-in plastic mold one-time programmable ROM, incomplete
electrical connection between the PROM writer and socket adapter causes writing errors and, makes the
computer unoperatable. To enhance the writing efficiency, attention should be paid to the following points:
(a) Make sure that the socket adapter is firmly fixed to the PROM writer and connected electrically with
each other (neither opened nor shorted), before starting the writing process.
(b) To secure the electrical connection between the contact pin and IC lead, make sure that there is no
foreign substance on the contact pin of the socket adapter, which may cause improper electrical
connection.
(c) When inserting the IC, be careful to protect the IC lead from bending in order to secure the electrical
connection between the contact pin and IC lead. If the lead is bent, correct the bending and insert it
again.
(d) If any trouble is noticed during a blank check to be performed to prevent erroneous writing due to
improper electrical connection, carry out the writing process again according to above steps (a), (b), and
(c).
(e) During the writing process, do not touch the socket adapter and IC to prevent erroneous writing.
(f) To write continuously in the IC, follow steps (a), (b), (c), (d) and (e).
(g) If a writing error recurs, or the rate of writing errors occur frequently, stop writing and check the PROM
writer, socket adapter, etc. for defects.
(h) If any problem is noticed in the written program or in the program after being left at a high temperature,
consult our technical staff.
(2) Precautions when new PROM writer, socket adapter or IC is used
When a new PROM writer, socket adapter or IC is employed, breakdown of the IC may occur or its writing
may become impossible because the noise, overshoot, timing or other electrical characteristics may be
inconsistent with the assured IC writing characteristics. To avoid such troubles, check the following points
before starting the writing process.
(a) To ensure stable writing operation, check that the V
CC
of the power supplied to the PROM writer,
power source current capacity of V
PP
, and current consumption at the time of writing to IC are provided
with sufficient margin.
(b) To prevent breakdown of the IC, check that the power source voltage between GND-V
CC
and GND-
V
PP
, and overshoot or undershoot of the power source at the connecting terminal of the socket adapter
are within the ratings. Particularly, if the overshoot or undershoot exceeds the maximum rating, the p-n
connection may be damaged, leading to permanent breakdown. If overshoot or undershoot occurs,
recheck the power source damping resistance of capacity.
(c) To prevent breakdown of the IC and for stable writing and reading operation, insert the IC into the
socket adapter and check the power noise between the GND-V
CC
and GND-V
PP
near the IC connecting
相關PDF資料 |
PDF描述 |
|---|---|
| HD404889 | Low-Voltage AS Microcomputers with On-Chip LCD Circuit(片上LCD電路的低壓微計算機) |
| HD4048912 | Low-Voltage AS Microcomputers with On-Chip LCD Circuit(片上LCD電路的低壓微計算機) |
| HD404898 | Low-Voltage AS Microcomputers with On-Chip LCD Circuit(片上LCD電路的低壓微計算機) |
| HD404899 | Low-Voltage AS Microcomputers with On-Chip LCD Circuit(片上LCD電路的低壓微計算機) |
| HD404918 | CMOS 4-bit single-chip microcomputer of the HMCS400 series incorporates ROM,RAM,1 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HD404888H | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Low-Voltage AS Microcomputers with On-Chip LCD Circuit |
| HD404888TE | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Low-Voltage AS Microcomputers with On-Chip LCD Circuit |
| HD404889 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Low-Voltage AS Microcomputers with On-Chip LCD Circuit |
| HD404889/HD404899/HD404878/HD404868SERIES | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| HD404889_03 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Low-Voltage AS Microcomputers with On-Chip LCD Circuit |
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