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HD66760 Datasheet(PDF) 61 Page - Hitachi Semiconductor |
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HD66760 Datasheet(HTML) 61 Page - Hitachi Semiconductor |
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61 / 105 page  HD66760 61 8. Read/Write mode 4: AM = 1, LG2–0 = 100/101 This mode is used when the data is vertically written by comparing the original data and the set value of the compare register (CP7–0). It reads the display data (original data), which has already been written in the GRAM, compares the original data and the set value of the compare register in byte units, and writes the data sent from the microcomputer to the GRAM only when the result of the compare operation satisfies the condition. This mode reads the data during the same access-pulse width (68-system: enabled high level, 80-system: RD* low level) as the write operation since reading the original data does not latch the read data into the microcomputer but temporarily holds it in the read-data latch. However, the bus cycle requires the same time as the read operation. The swap function (SWP) and write-data mask function (WM15–0) are also enabled in these operations. After writing, the address counter (AC) automatically increments by 256, and automatically jumps to the upper-right edge (I/D = 1) or upper-left edge (I/D = 0) following the I/D bit after it has reached the lower edge of the GRAM. Notes: 1. The bits in the GRAM indicated by '*' are not changed. 2. After writing to address 4F00H, the AC jumps to 0001H. WM15 WM0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 DB15 DB0 1 0 1 1 1 1 0 0 0 1 1 0 0 0 0 1 1 1 0 0 0 0 1 1 1 0 0 0 1 1 0 0 1 1 1 1 0 1 0 0 0 0 0 1 1 1 1 1 1 0 0 1 1 0 0 1 0 1 0 1 0 0 1 1 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 0 0 1 1 0 CP7 CP0 0 1 0 1 0 0 1 1 C C C R R R (Unmatched) (Unmatched) (Unmatched) (Unmatched) 1 0 1 1 1 1 0 0 0 1 0 1 0 0 1 1 1 1 0 0 0 0 1 1 1 0 0 0 1 1 0 0 0 0 0 1 1 1 1 1 0 1 0 1 0 0 1 1 "0000"H Write data (1) GRAM "0080"H "0100"H Write data (2) Write data (3) "4F00"H "0000"H "0001"H 1 0 1 1 1 1 0 0 0 1 0 1 0 0 1 1 1 1 0 0 0 0 1 1 1 0 0 0 1 1 0 0 0 0 0 1 1 1 1 1 0 1 0 1 0 0 1 1 Compare operation Compare operation Compare operation Compare register: Conditional replacement Conditional replacement Conditional replacement Write data (1): Write data (2): Write data (3): Read data (1): Read data (2): Read data (3): Operation Examples: 1) I/D = "1", AM = "1", LG2-0 = "101" (unmatched write), SWP = "0" 2) CP7–0 = "53H" 3) WM15–0 = "0000"H 4) AC = "000"H Write-data mask: Figure 41 Writing Operation of Read/Write Mode 4 |
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