Abstract: A semiconductor integrated circuit comprises a test mode decision circuit which decides a normal operation mode or a test mode when having input a clock from a reset state and started an operation by using a scan enable signal that is used for a scan test, and retains a decision result until the decision result is reset; a scan enable mask circuit which disables the transmission of a scan enable signal to an internal scan circuit according to a decision result signal; and an access control unit which disables the access to the internal memory unit according to the decision result signal output from the test mode decision circuit. Furthermore, the semiconductor integrated circuit has a configuration of using the scan enable signal and the normal operation input signal in common.

Abstract: An ink tank receives data signals from a printer and an LED provided on the ink tank is driven on the basis of the received data signals. The LED is driven in an inactive time period that is different from the time period in which the date signals are input to the ink tank.

Abstract: An ink tank receives data signals from a printer and an LED provided on the ink tank is driven on the basis of the received data signals. The LED is driven in an inactive time period that is different from the time period in which the date signals are input to the ink tank.

Abstract: An ink tank detachably mounted on a printer includes a non-volatile memory and a LED for executing a process in response to a condition of the tank such as ink residual quantity by transmitting information stored in the memory to a printer, and informing the condition of the ink by use of the LED. Further, the content stored in the memory is prevented from being destroyed, and the LED can perform light emission until immediately before detachment and thus contribute to improvement in workability of a user. A volatile memory element is provided in addition to the non-volatile memory. When a user can detach the tank, condition information on the ink tank retained by the non-volatile memory is transferred to the volatile memory in advance. When it is possible to detach the tank, control for turning the LED on and off is achieved by accessing only to the volatile memory.

Abstract: A semiconductor integrated circuit comprises a test mode decision circuit which decides a normal operation mode or a test mode when having input a clock from a reset state and started an operation by using a scan enable signal that is used for a scan test, and retains a decision result till the decision result is reset; a scan enable mask circuit which disables the transmission of a scan enable signal to an internal scan circuit according to a decision result signal; and an access control unit which disables the access to the internal memory unit according to the decision result signal output from the test mode decision circuit. Furthermore, the semiconductor integrated circuit has a configuration of using the scan enable signal and the normal operation input signal in common.

Abstract: An ink tank receives data signals from a printer and an LED provided on the ink tank is driven on the basis of the received data signals. The LED is driven in an inactive time period that is different from the time period in which the date signals are input to the ink tank.

Abstract: An ink tank detachably mounted on a printer includes a non-volatile memory and a LED for executing a process in response to a condition of the tank such as ink residual quantity by transmitting information stored in the memory to a printer, and informing the condition of the ink by use of the LED. Further, the content stored in the memory is prevented from being destroyed, and the LED can perform light emission until immediately before detachment and thus contribute to improvement in workability of a user. A volatile memory element is provided in addition to the non-volatile memory. When a user can detach the tank, condition information on the ink tank retained by the non-volatile memory is transferred to the volatile memory in advance. When it is possible to detach the tank, control for turning the LED on and off is achieved by accessing only to the volatile memory.

Abstract: A median filter using an M×N window sorts M×N pixel data along each column in descending order to generate N data strings, each having M sorted pixel data. The N data strings are sequentially stored in a shift register. Data strings in different stages of the shift register are merged with one another in descending order to generate a new sorted data string. Such sorted data strings are again merged with each other to generate a data string having M×(N?1) sorted data. M+1 data surrounding the median value of the data string are merged with a data string having M sorted data in descending order to generate a data string having 2M+1 sorted data. The data value at the median rank of the 2M+1 sorted data is output as the median value of the M×N image data.

Abstract: A median filter using an M×N window sorts M×N pixel data along each column in descending order to generate N data strings, each having M sorted pixel data. The N data strings are sequentially stored in a shift register. Data strings in different stages of the shift register are merged with one another in descending order to generate a new sorted data string. Such sorted data strings are again merged with each other to generate a data string having M×(N−1) sorted data. M+1 data surrounding the median value of the data string are merged with a data string having M sorted data in descending order to generate a data string having 2M+1 sorted data. The data value at the median rank of the 2M+1 sorted data is output as the median value of the M×N image data.

Abstract: A parametric curve generating device for developing a Bezier curve is provided. The device is capable of executing a high speed division operation with a limited magnitude of hardware scale. Adders perform calculations that are stored in registers. Convergence discrimination circuits discriminate whether data stored in the registers converge. Subsequent processing varies depending on the discrimination result. A stack memory is used to store data from the registers.

Abstract: A minimum coordinate value at least in one direction of a parameter data group including a start point and an end point of a stroke is detected and outline coordinates are generated from the parameter data group by an outline coordinate generator and a minimum coordinate detector. An outline data generator stores range data indicative of a painting range into a predetermined address in an outline buffer on the basis of the outline coordinates and the minimum coordinate value or the maximum coordinate value. An address generator generates a drawing start address and an end address in a bit map memory in accordance with a value based on the minimum coordinate value and the predetermined address and with the range data. A painter paints by writing the same value into all data between the drawing start address and end address in the bit map memory, thereby generating a character pattern at a high speed by a buffer memory of a small capacity.