JPS59157895A - Integrated circuit device incorporating read-only memory - Google Patents

Abstract

PURPOSE:To reduce the power consumption during a writing mode by stopping the internal clock with a writing signal. CONSTITUTION:The clock is produced with an external crystal, and a PROM part is set in a writing mode when a writing signal 1 is set at a high level. The signal 1 turns off a control gate 5 only to the parts excepting the PROM, and therefore no internal clock 6 is sent to the inside of a circuit. As a result, the gate of each circuit is never switched to reduce the power consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to integrated circuit devices, and in particular to complementary insulated gate field effect transistors (0MO8) programmable read only memory (FROM) or 0MO8 FRO
The present invention relates to the configuration of an integrated circuit that can be applied to a processor unit (CPU) with a built-in CPU.

Conventionally, in this type of FROM or an integrated circuit with a built-in FROM, a clock was supplied to a part other than the PROM section when writing data to the FROM, and therefore the circuit operated in a certain state. Therefore, this state has the disadvantage that a considerable amount of power is consumed.

The present invention eliminates the above drawbacks by stopping the internal clock with a write signal, and provides a device that consumes as little power as possible during writing.

Accordingly, the system clock controlled by the write signal and this convolution signal in the Ichip CMO8 integrated circuit with built-in PRO,M? An integrated circuit device characterized by having the following features is obtained.

Next, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, the clock is generated by an external crystal. When the write signal 1 becomes high level, the PROM section starts the write operation, but the write signal 1 causes the υ control gate 5 to is turned off, and the internal clock 6 is not sent inside the circuit. Therefore, no switching occurs at the gates of each circuit, reducing power consumption.

FIG. 2 shows another embodiment in which clock input from the outside is 9.
is sent to the control gate 11 as an internal clock 10 to the inside of the control gate 11.
1 is OFF, the internal clock 10 remains at a LOW level. In this way, the PROM8VC is regenerated, but in the meantime, the power dissipated in circuits other than the PROM is reduced.

1chip CMO with built-in FROM as shown in (7)
8 By simply using the write signal to the ycPROM part of the integrated circuit to control the internal clock, the effect on writing remains the same, but an integrated circuit device can be created that consumes as little power as possible in areas other than the PROM. .

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing one embodiment of the present invention partially in blocks, and FIG. 2 is a circuit diagram partially showing another embodiment in blocks. In the figure, l... write signal, 2...
...PROM part, 3...C, G, part, 4...
...External crystal, 5...Control gate,
6... Internal clock, 7... Write signal, 8... PROM section, 9... Clock input, 10... Internal clock , 11...
- Control gate.

Claims (1)

[Claims] An integrated circuit device having a built-in read-only memory, the integrated circuit device having a built-in read-only memory, the integrated circuit device having a write signal and a system clock controlled by the write signal.