Method of controlling a semiconductor integrated circuit

Claim 3

The method of controlling a semiconductor integrated circuit device according to claim 1, wherein the semiconductor circuit further includes an input/output circuit having its input and output terminals coupled to said external terminal, and wherein said method further comprises outputting a control signal for setting the data, which is to be outputted from said input/output circuit to said external terminal, at said predetermined level.

Claim 4

The method of controlling a semiconductor integrated circuit device according to claim 2, further comprising receiving a write-controlling a signal at a write-controlling external terminal for controlling the write-in of data to said electrically programmable read only memory, detecting a voltage level which is provided at said write-controlling external terminal for providing an output signal indicative of the detected voltage level, and responding to the output signal to output control signals to be fed to said electrically programmable read only memory.

Claim 5

The method of controlling a semiconductor integrated circuit device according to claim 2, wherein said electrically programmable read only memory is coupled to a write unit, and wherein said method further comprises setting the predetermined level of the signal to be outputted to said external terminal at a level equal to a level set in said write unit for said electrically programmable read only memory to indicate satisfactory operation of said electrically programmable read only memory.

Claim 6

In an integrated microcomputer including a microprocessor, an electrically programmable read only memory which is coupled to the microprocessor and which is to store data constituting a program that is executed by the microprocessor and which is accessed by either the microprocessor or from outside of the integrated microcomputer, wherein the electrically programmable read only memory has a predetermined address space defining a range of addresses assigned thereto, a method of programming the data into the electrically programmable read only memory comprising the steps of: applying an address signal from the outside of the integrated microcomputer to the integrated microcomputer; applying data from the outside of the integrated microcomputer to the integrated microcomputer; discriminating whether or not an address designated by the address signal is within the predetermined address space; writing the data into the electrically programmable read only memory and subsequently reading out data written into the address of the electrically programmable read only memory designated by the address signal if the address designated by the address signal is within the predetermined address space; and providing a data signal having a predetermined level to the outside of the integrated microcomputer from the integrated microcomputer if the address designated by the address signal is not within the predetermined address space.

Claim 7

In an integrated microcomputer including a microprocessor, an electrically programmable read only memory which is coupled to the microprocessor and which is to store data constituting a program that is executed by the microprocessor and which is accessed by either the microprocessor or from outside of the integrated microcomputer, wherein the electrically programmable read only memory has a predetermined address space defining a range of addresses assigned thereto, a method of programming the data into the electrically programmable read only memory comprising the steps of: applying an address signal from the outside of the integrated microcomputer to the integrated microcomputer; applying data from the outside of the integrated microcomputer to the integrated microcomputer; discriminating whether or not an address designated by the address signal is within the predetermined address space; writing the data into the electrically programmable read only memory and subsequently reading out data written into the address of the electrically programmable read only memory designated by the address signal if the address designated by the address signal is within the predetermined address space; and providing a data signal having a predetermined level to the outside of the integrated microcomputer from the integrated microcomputer if the address designated by the address signal is not within the predetermined address space.

Claim 8

The method according to claim 5, wherein the integrated microcomputer further includes a random access memory having a second predetermined address space defining a range of addresses assigned thereto, and wherein the discriminating step discriminates whether the address designated by the address signal is within the predetermined address space of the electrically programmable read only memory or the second predetermined address space of the random access memory.

Claim 9

In a one-chip microcomputer including an electrically programmable read only memory in which data constituting a program is written and subsequently checked by a write unit provided on the outside of the one-chip microcomputer, and a microprocessor which is coupled to the electrically programmable read only memory and which executes a predetermined data processing operation in accordance with the program stored in the electrically programmable read only memory has a predetermined address space defining a range of addresses assigned thereto, a method of programming the data into the electrically programmable read only memory comprising the steps of: applying an address signal and data from write unit to the one-chip microcomputer; discriminating whether or not an address designated by the address signal is within the predetermined address space; writing the data into the electrically programmable read only memory and subsequently reading out data written into the address of the electrically programmable read only memory designated by the address signal if the address designated by the address signal is within the predetermined address space; and providing a data signal having a predetermined level to the write unit from the one-chip microcomputer if the address designated by the address signal is not within the predetermined address space.

Claim 10

In a one-chip microcomputer including an electrically programmable read only memory in which data constituting a program is written and subsequently checked by a write unit provided on the outside of the one-chip microcomputer, and a microprocessor which is coupled to the electrically programmable read only memory and which executes a predetermined data processing operation in accordance with the program stored in the electrically programmable read only memory has a predetermined address space defining a range of addresses assigned thereto, a method of programming the data into the electrically programmable read only memory comprising the steps of: applying an address signal and data from write unit to the one-chip microcomputer; discriminating whether or not an address designated by the address signal is within the predetermined address space; writing the data into the electrically programmable read only memory and subsequently reading out data written into the address of the electrically programmable read only memory designated by the address signal if the address designated by the address signal is within the predetermined address space; and providing a data signal having a predetermined level to the write unit from the one-chip microcomputer if the address designated by the address signal is not within the predetermined address space.

Claim 11

The method according to claim 7, wherein the one-chip microcomputer further includes a random access memory having a second predetermined address space defining a range of addresses assigned thereto, and wherein the discriminating step discriminates whether the address designated by the address signal is within the predetermined address space of the electrically programmable read only memory or the second predetermined address space of the random access memory.