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HD44780UBXXTF Datasheet(PDF) 22 Page - Hitachi Semiconductor |
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HD44780UBXXTF Datasheet(HTML) 22 Page - Hitachi Semiconductor |
22 / 59 page HD44780U 22 Interfacing to the MPU The HD44780U can send data in either two 4-bit operations or one 8-bit operation, thus allowing interfacing with 4- or 8-bit MPUs. • For 4-bit interface data, only four bus lines (DB4 to DB7) are used for transfer. Bus lines DB0 to DB3 are disabled. The data transfer between the HD44780U and the MPU is completed after the 4-bit data has been transferred twice. As for the order of data transfer, the four high order bits (for 8-bit operation, DB4 to DB7) are transferred before the four low order bits (for 8-bit operation, DB0 to DB3). The busy flag must be checked (one instruction) after the 4-bit data has been transferred twice. Two more 4-bit operations then transfer the busy flag and address counter data. • For 8-bit interface data, all eight bus lines (DB0 to DB7) are used. RS R/W E IR7 IR6 IR5 IR4 BF AC6 AC5 AC4 DB7 DB6 DB5 DB4 Instruction register (IR) write Busy flag (BF) and address counter (AC) read Data register (DR) read IR3 IR2 IR1 IR0 AC3 AC2 AC1 AC0 DR7 DR6 DR5 DR4 DR3 DR2 DR1 DR0 Figure 9 4-Bit Transfer Example |
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