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UPD17062 Datasheet(PDF) 248 Page - Renesas Technology Corp |
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UPD17062 Datasheet(HTML) 248 Page - Renesas Technology Corp |
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248 / 298 page  246 µPD17062 20.4 VRAM VRAM is the memory that holds data used to select a picture pattern that the IDC displays on a screen such as a TV screen. In the µPD17062, the VRAM data is allocated at BANK1 and BANK2 in data memory. One VRAM data item (8 bits) is held at two adjoining addresses (even and odd address). BANK1 and BANK2 are each mapped at 112 nibbles of data memory (total of 224 nibbles, or 224 × 4 bits). That is, up to 112 VRAM data items can be specified. Fig. 20-1 VRAM Configuration VRAM data consists of 8 bits. Of the 8 bits, the upper 2 bits are the ID field. The ID field indicates the type of VRAM data. The lower 6 bits are the data field. The data field contains the display data or control data. 01 23 45 67 89 A B C D E F 0 1 2 3 4 5 6 VRAM data Column address Even address Odd address 4 bits 4 bits (2 data memory locations) |
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