PCF2119RUSLASH2SLASHF2 datasheet(39/79 Pages) NXP

39 / 79 page

PCF2119X_5

Product data sheet

Rev. 05 — 13 August 2009

39 of 79

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.

Fig 23. 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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