PCF2113DUSLASHF4 datasheet(36/65 Pages) NXP

36 / 65 page

PCF2113_FAM_4

Product data sheet

Rev. 04 — 4 March 2008

36 of 65

NXP Semiconductors

PCF2113x

LCD controllers/drivers

11. Interfaces to microcontroller

11.1 Parallel interface

The PCF2113x 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 data lines DB7 to DB0. Three

further control lines E, RS and R/W are required (see Section 7).

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

transaction. The higher order bits (corresponding to bits DB7 to DB4 in 8-bit mode) are

sent in the ﬁrst cycle and the lower order bits (corresponding to bits DB3 to DB0 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 22, Figure 23 and Figure 24 for examples of bus

protocol.

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

internally.

Fig 22. 4-bit transfer example

mga804

DB7

R/W

DB6

DB5

DB4

instruction

write

busy flag and

address counter read

data register

read

IR7

IR3

AC3

DR7

DR3

IR6

IR2

AC6

AC2

DR6

DR2

IR5

IR1

AC5

AC1

DR5

DR1

IR4

IR0

AC4

AC0

DR4

DR0

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