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1. 发明专利

JPH06119469A EMICONDUCTOR DEVICE 失效
公开(公告)号：JPH06119469A
公开(公告)日：1994-04-28
申请号：JP28660292
申请日：1992-10-01
申请人： HITACHI LTD , HITACHI MICOM SYST KK
发明人： HASHIMOTO KOICHIRO , SHINAGAWA YUTAKA , SUZUKAWA KAZUFUMI , TOTANI TATSURO , SHIBUKAWA YOSHIMICHI
IPC分类号： G06F15/78 , H01L21/8246 , H01L27/112
摘要： PURPOSE:To prevent information obtd. from an initial user from being leaked while reducing the cost of a microcomputer or the like by providing the semiconductor device of the single chip microcomputer or the like capable of turning a built-in mask ROM to a use disable state without performing any bonding processing. CONSTITUTION:The activating part ROMS of a read only memory ROM composed of a mask ROM is provided with a start control MOSFETCN 1 for selectively changing the threshold voltage by selectively performing ion injection after a protection film at least the upper part of the channel is partially removed or thinned previously and the protection film is formed. By selectively turning on this start control MOSFETCN 1, a start control signal ROME to the read only memory ROM is selectively made invalid.

2. 发明专利

JPH05314781A NONVOLATILE SEMICONDUCTOR MEMORY 失效
公开(公告)号：JPH05314781A
公开(公告)日：1993-11-26
申请号：JP12031192
申请日：1992-05-13
申请人： HITACHI LTD , HITACHI MICOM SYST KK
发明人： SHIBUKAWA YOSHIMICHI , HAYAKAWA AKIO
IPC分类号： G11C17/00 , G11C16/02 , G11C16/06
摘要： PURPOSE:To adjust a data rewriting time by providing a register capable of setting the rewriting time. CONSTITUTION:In an EEPROM, the register 23 for setting the data rewriting time is provided in a timer part 13 and the rewriting time is set freely through a system CDU and held in the register 23. The frequency division output of a frequency divider circuit 21 is selected to which a system clock is supplied based on the holding information and the rewriting time of the EEPROM is adjusted. Thus, the data rewriting time is optimized for the characteristic fluctuation of a memory cell due to a manufacturing process and the data rewriting time is revised according to an applied system.

3. 发明专利

JPS62165253A LSI INCORPORATED NON-VOLATILE MEMORY 失效
公开(公告)号：JPS62165253A
公开(公告)日：1987-07-21
申请号：JP647086
申请日：1986-01-17
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： NAKAUCHI NORIO , SHIBUKAWA YOSHIMICHI
IPC分类号： G06F12/14 , G06F21/02 , G11C16/02 , G11C17/00
摘要： PURPOSE:To protect security of only the desired data by providing a security means which makes the access to a block from the external impossible when an address signal accesses this block corresponding to a security bit of a non- volatile memory. CONSTITUTION:Security bits b0-b7 corresponding to several blocks in 1:1 are provided for an EPROM 2 divided into these blocks. A decoder 4 is provided which decodes the address signal from the external and outputs a signal, which permits or inhibits the access to the address of the EPROM corresponding to a security bit, if the address signal accesses the address designated by this security bit. The address access to the EPROM is controlled to perform the write to the EPROM and the access inhibition for each block. Thus, security of only desired data out of data written in a non-volatile memory like an EPROM incorporated in an LSI is protected.

4. 发明专利

JPH0373043A DATA PROCESSOR 失效
公开(公告)号：JPH0373043A
公开(公告)日：1991-03-28
申请号：JP20781289
申请日：1989-08-14
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： NAKAUCHI NORIO , SHIBUKAWA YOSHIMICHI
IPC分类号： G06F12/14 , G06F21/02 , G06F21/24
摘要： PURPOSE:To protect the secrecy of data in an EPROM by inputting the read signal of an extension prohibiting bit to a mode control circuit, which forms a control signal, and prohibiting the bus extension mode of a single chip microcomputer when write is executed to the bit. CONSTITUTION:A protecting circuit 8 is provided with the extension prohibiting bit for setting whether the bus extension mode is prohibited or not, and a protect bit for setting whether the data in the EPROM are made secret or not. The respective bits constituting this protecting circuit 8 are constituted so that the extension prohibiting bit is selected in a CPU mode and the protect bit can be selected in a program mode when an EPROM 1 is accessed. A signal read out from the protecting circuit 8 is supplied to a mode control circuit 3 as a protect signal Pr and when write is executed to the bit, a port is controlled so that the bus extension mode of the single chip microcomputer can be prohibited. Thus, the secrecy of the data in the built-in EPROM can be effectively protected.

5. 发明专利

JPH04181745A SEMICONDUCTOR INTEGRATED CIRCUIT 失效
公开(公告)号：JPH04181745A
公开(公告)日：1992-06-29
申请号：JP30891390
申请日：1990-11-16
申请人： HITACHI LTD , HITACHI MICRO SYSTEM KK
发明人： MATSUMOTO YASUNOBU , SHIBUKAWA YOSHIMICHI
IPC分类号： H01L21/60
摘要： PURPOSE:To restrain the size of a semiconductor chip from being made large and to make the electric resistance of a power-supply interconnection inside the chip proper by a method wherein a power-supply pad is formed in the active region of the semiconductor chip. CONSTITUTION:A semiconductor chip 1 is provided with the following: an analog module 9 formed of an analog circuit; and a digital module 10 formed of a digital circuit. Regions in which the modules 9, 10 have been formed are set as active regions; regions other than them are set as inactive regions. The chip is provided with leads 11 to 28 supported by a package or the like and with bonding pads 31 to 48. The bonding pads 31, 32 are formed in the active regions formed in the analog module 9 and the digital module 10, and are used as power-supply pads. Consequently, the length of power-supply interconnections reaching individual functional block cells inside the chip 1 from the power-supply pads is made proper. Thereby, it is possible to restrain the size of the chip from being made large and to make the electric resistance of the power-supply interconnections inside the chip proper.

6. 发明专利

JPS63106851A DATA PROCESSING UNIT 失效
公开(公告)号：JPS63106851A
公开(公告)日：1988-05-11
申请号：JP25170986
申请日：1986-10-24
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： NAKAMURA TAKUMI , SHIBUKAWA YOSHIMICHI , SATO TSUNEO , IWASHITA HIROYUKI
IPC分类号： G06F12/14 , G06F13/18 , G06F15/78 , G06F21/02 , G06F21/24
摘要： PURPOSE:To secure a data in an EPROM by devising such that a data in the EPROM is not read through the use of a bus extension mode in a single chip microcomputer incorporating the Erasable Programmable ROM (EPROM) and having a bus extension mode. CONSTITUTION:A protect bit 8 comprising a nonvolatile storage element to set whether or not a data in the EPROM 11 is to be secured is provided in a single chip microcomputer incorporating the EPROM 1 and having the bus expansion mode. Then the information of the protect bit 8 is given to a mode control circuit 9 forming a control signal operating the inside of the single chip microcomputer at the set mode and when a write is applied to the protect bit 8, the bus expansion mode of the single pitch microcomputer is inhibited. Since the bus expansion mode itself is inhibited, the data secrecy in the EPROM is protected.

7. 发明专利

JPS60136341A SEMICONDUCTOR DEVICE 失效
公开(公告)号：JPS60136341A
公开(公告)日：1985-07-19
申请号：JP24404783
申请日：1983-12-26
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： SHIBUKAWA YOSHIMICHI , HAGIWARA YASUHISA , UCHIUMI CHIKATAKE , TACHIKI TAKUO
IPC分类号： H01L21/8247 , H01L23/02 , H01L29/788 , H01L29/792
摘要： PURPOSE:To obtain the highly reliable semiconductor device with which a light elimination and a rewriting-in of memory can be performed by a method wherein a light-transmitting member is formed in a tightly fixed manner at the package part located at the upper part of a pellet, and a window is provided thereon. CONSTITUTION:A pellet 3 is attached to the bottom part of the cavity 1 of a package substrate 2, and a bonding pad and an inner lead 4 are bonded by a wire 5 for the purpose of obtaining electric conductivity between the pellet 3 and the outside part. A light-irradiating window 7 is formed at the upper part of the pellet 3 by airtightly sealing the cavity 1 on the circumference of the cavity aperture part located at the upper part of the package substrate 2. As said light irradiating window 7 is formed using a transparent alumina sintered plate, it transmits ultraviolet rays sufficiently, and besides, as the window 7 is formed at the upper part of the pellet 3 in the size which sufficiently covers the pellet, the light elimination of memory can be performed without fail.

8. 发明专利

JPS62194565A LSI INCORPORATING NON-VOLATILE MEMORY 失效
公开(公告)号：JPS62194565A
公开(公告)日：1987-08-27
申请号：JP3517686
申请日：1986-02-21
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： NAKAMURA ISAO , NAKAUCHI NORIO , SHIBUKAWA YOSHIMICHI
IPC分类号： G06F12/14 , G06F15/78 , G06F21/02 , G06F21/22
摘要： PURPOSE:To protect the security of data written in an EPROM to improve the security by providing a protecting circuit and writing data in at least one of plural protection bits in this protecting circuit. CONSTITUTION:A single chip microcomputer provided in a circuit block 20 consists of a microprocessor 1, an EPROM 2, a protecting circuit 3, input/output ports 4 and 5, etc., and they are connected mutually through an address bus AB and a data bus DB. Memory cells D1 and D0 as protection bits are provided in the circuit 3 and are set to '1' in the initial state. After data is written in each address of the EPROM 2, '0' is written in at least one of bits D1 and D0 to make it impossible that data is read out from the external through signal control gates G1-G6. Thus, the security of data written in the EPROM 2 is protected to improve the reliability of security.

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