JPH0481072A - Picture memory circuit for printer device - Google Patents

Abstract

PURPOSE:To enable drawing without rotationally operating a processor by setting a data read direction vertical on a picture memory in the case of rotational printing. CONSTITUTION:In the case of rotational printing, after the second word, an adder 7 calculates the sum of the A-side value (X value) of an increment storage register 6 and a preceding address value, this sum is set to a second address register 4 as the next high-order address, and this value is applied through an address selector 5 to a picture memory 1. The picture data is selected by a selector 14 and outputted to an output (g) for each bit and when the number of count clocks (d) in the data reaches Y, a carry signal (f) is outputted from a data counter 10. At such a time, the B of the increment memory register 6 is selected, and the address of the head bit in the next scan line is calculated by the adder 7 and stored in the second address register 4. Thus, it is not necessary to write a dot image in the picture memory after rotation, and performance is improved in the case of rotational printing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printer device, and more particularly to an image memory circuit of a printer device that reads data drawn on an image memory.

[Prior Art] Conventionally, printer devices of this type have non-rotational printing and rotational printing as print modes. In non-rotational printing, the encoded data given from the host device is decoded and written as a dot image into the image memory, and in rotary printing, the dot image is rotated when it is written into the image memory.

[Problems to be Solved by the Invention] In the conventional printer device described above, in the rotation printing mode, it was necessary to rotate the dot image and then write it to the image memory, so the performance during rotation printing deteriorated. There was a drawback that

[Means for Solving the Problems] The present invention provides an image memory circuit for a printer device that has an image memory for one page and expands and outputs one page of data in the image memory according to code data from a host device. , an image memory consisting of a chip of 1 word and 1 bit, an address supply means for accessing 1 bit on the image memory, a storage means for notifying one rotation of the specific rotation, and an image memory consisting of a chip of one word of the image memory, an address supply means for accessing one bit on the image memory, a storage means for notifying one specific rotation, The invention is characterized by comprising means for selecting one bit of the .

[Example code] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention. The image memory 1 is composed of 16 memory chips each having one word and one bit. The control unit 2 controls reading and writing of the image memory 1. The start address of one scan line is written to the first address register 3 and lower address register 9 from the host processor via the signal a. The direction of printing is stored in mode register 8 by the host processor via signal e. In the case of non-rotational printing, the addresses from the second address register 4 are given to the image memory 1 via the address selector 5 from the second word onwards. From the second word onward, the second address register 4 is counted up by one in response to the take-up signal d. In this case, the lower 4 bits of the address have no meaning, so the selector 11
is selected, and all 16 chips of image memory 1 become accessible. The data in the image memory 1 is read out using an output signal from the control section 2, and is outputted bit by bit to g in a shift register 13 in accordance with a shift clock.

On the other hand, in the case of rotation printing, from the second word onwards, the adder 7 calculates the sum of the value on the A side of the incremental storage register 6 (X value in Figure 2) and the previous address value, and this sum is added to the next This value is set in the second address register 4 as the upper address of
It is applied to the image memory 1 via the address selector 5. The bit address stored in the lower address register 9 is sent to the decoder 12, and a select signal for the chip corresponding to the decoded bit address is applied to the image memory 1 via the selector 11. Image data is selector 14
is selected and output one bit at a time to g. When the number of data count clocks d reaches Y, the data counter 10 outputs a carry signal f, and at this time B of the incremental storage register 6 is selected, and the address of the first bit of the next scan line is transferred to the adder 7. The second
Stored in address register 4.

[Effects of the Invention] As explained above, the present invention has the advantage that the image memory can be
By using bit chips and making the data readout direction vertical on the image memory during rotational printing, the processor can draw as usual, that is, without rotational operations, thus saving the time previously required for rotational printing. This becomes unnecessary and has the effect of apparently improving the processing speed of the processor.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a conceptual diagram of an image memory. DESCRIPTION OF SYMBOLS 1... Image memory, 2... Control unit, 3... First address register, 4... Second address register, 5...
... Address selector, 6... Incremental storage register, 7
... Adder, 8... Mode register, 9... Lower address register, 10... Data counter, 11.
...Selector, 12...Decoder, 3...Shift register, 14...Selector.

Claims (1)

[Claims] In the image memory circuit of a printer device, which has an image memory for one page and expands one page of data into the image memory and outputs it according to coded data from a host device, the image memory consists of a chip of 1 word and 1 bit. and address supply means for accessing one bit on the image memory, storage means for notifying the specific rotation and rotation, and means for selecting one bit in one word of the image memory. An image memory circuit of a printer device featuring features.