PCF2105MU データシートの表示（PDF） - Philips Electronics

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PCF2105MU

LCD controller/driver

Philips Electronics 

Philips Semiconductors

LCD controller/driver

Product specification

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.

RS

R/W

E

DB7

IR7

IR3

BF

AC3

DR7

DR3

DB6

IR6

IR2

AC6

AC2

DR6

DR2

DB5

IR5

IR1

AC5

AC1

DR5

DR1

DB4

IR4

IR0

instruction

write

AC4

AC0

busy flag and

address counter read

DR4

DR0

data register

read

MGA804

1998 Jul 30

Fig.13 4-bit transfer example.

20

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