PCF2119VU-2 Просмотр технического описания (PDF) - NXP Semiconductors.

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производитель

PCF2119VU-2

LCD controllers/drivers

NXP Semiconductors. 

NXP Semiconductors

PCF2119x

LCD controllers/drivers

11. Basic architecture

11.1 Parallel interface

The PCF2119x can send data in either two 4-bit operations or one 8-bit operation and can

thus interface to 4-bit or 8-bit microcontrollers.

In 8-bit mode data is transferred as 8-bit bytes using the 8 ports DB7 to DB0. Three

further control lines E, RS and R/W are required.

In 4-bit mode data is transferred in two cycles of 4 bits each using ports DB7 to DB4 for

the transaction. The higher order bits (corresponding to range of bit 7 to bit 4 in 8-bit

mode) are sent in the first cycle and the lower order bits (bit 3 to bit 0 in 8-bit mode) in the

second cycle. Data transfer is complete after two 4-bit data transfers. It should be noted

that two cycles are also required for the busy flag check. 4-bit operation is selected by

instruction (see Figure 23 to Figure 25 for examples of bus protocol).

In 4-bit mode, ports DB3 to DB0 must be left open-circuit. They are pulled up to VDD

internally.

RS

R/W

E

DB7

IR7

IR3

DB6

IR6

IR2

DB5

IR5

IR1

DB4

IR4

IR0

instruction

write

Fig 23. 4-bit transfer example

BF

AC3

AC6

AC2

AC5

AC1

AC4

AC0

busy flag and

address counter read

DR7

DR3

DR6

DR2

DR5

DR1

DR4

DR0

data register

read

mga804

PCF2119X_5

Product data sheet

Rev. 05 — 13 August 2009

© NXP B.V. 2009. All rights reserved.

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