PCF2119AU/2DA/2 NXP [NXP Semiconductors], PCF2119AU/2DA/2 Datasheet - Page 39

• Manufacturer Part Number: PCF2119AU/2DA/2
• Description: LCD controllers/drivers
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
11. Basic architecture
PCF2119X_5
Product data sheet
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
In 4-bit mode, ports DB3 to DB0 must be left open-circuit. They are pulled up to V
internally.
Fig 23. 4-bit transfer example
R/W
DB7
DB6
DB5
DB4
RS
E
Figure 23
instruction
IR7
IR6
IR5
IR4
write
Rev. 05 — 13 August 2009
to
IR3
IR2
IR1
IR0
Figure 25
AC6
AC5
AC4
BF
for examples of bus protocol).
address counter read
busy flag and
AC3
AC2
AC1
AC0
DR7
DR6
DR5
DR4
LCD controllers/drivers
data register
PCF2119x
read
© NXP B.V. 2009. All rights reserved.
DR3
DR2
DR1
DR0
mga804
DD
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