PCF2105MUSLASH2 datasheet(20/48 Pages) PHILIPS

20 / 48 page

1998 Jul 30

Philips Semiconductors

Product speciﬁcation

LCD controller/driver

PCF2105

10 INTERFACE TO MICROCONTROLLER

(PARALLEL INTERFACE)

The PCF2105 can send data in either two 4-bit modes or

one 8-bit mode and can thus interface to 4 or 8-bit

microcontrollers.

In the 8-bit mode data is transferred as 8-bit bytes using

the 8 data lines DB7 to DB0. The control lines E, RS,

and R/W are required.

In the 4-bit mode data is transferred in two cycles of 4-bits

each. The higher order bits (corresponding to DB7 to DB4

in 8-bit mode) are sent in the first cycle and the lower order

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. The 4-bit mode is selected by instruction.

See Figs 13, 14 and 15 for examples of bus protocol.

In the 4-bit mode, the pads DB3 to DB0 must be left

open-circuit. They are pulled up to VDD internally.

Fig.13 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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