HD44780UBXXTF 查看數據表（PDF） - Hitachi -> Renesas Electronics

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HD44780UBXXTF

Dot Matrix Liquid Crystal Display Controller/Driver

Hitachi -> Renesas Electronics 

HD44780U

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

DB7

IR7

IR3

BF

AC3

DR7

DR3

DB6

IR6

IR2

AC6

AC2

DR6

DR2

DB5

IR5

IR1

AC5

AC1

DR5

DR1

DB4

IR4

IR0

AC4

AC0

DR4

DR0

Instruction register (IR)

write

Busy flag (BF) and

address counter (AC)

read

Data register (DR)

read

Figure 9 4-Bit Transfer Example

22

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