PCF2113X datasheet(32/72 Pages) PHILIPS

32 / 72 page

2001 Dec 19

Philips Semiconductors

Product speciﬁcation

LCD controllers/drivers

PCF2113x

10 INTERFACES TO MICROCONTROLLER

10.1

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 Chapter 6).

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 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. 4-bit operation is selected by instruction, see

Figs 17 to 19 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.

10.2

I2C-bus interface

The I2C-bus is for bidirectional, two-line communication

between different ICs or modules. The two lines are the

Serial Data line (SDA) and the Serial Clock Line (SCL).

Both lines must be connected to a positive supply via

pull-up resistors. Data transfer may be initiated only when

the bus is not busy.

Each byte of eight bits is followed by an acknowledge bit.

The acknowledge bit is a HIGH level signal put on the bus

by the transmitter during which time the master generates

an extra acknowledge related clock pulse. A slave receiver

which is addressed must generate an acknowledge after

the reception of each byte.

Also a master receiver must generate an acknowledge

after the reception of each byte that has been clocked out

of the slave transmitter.

The device that acknowledges must pull-down the SDA

line during the acknowledge clock pulse, so that the SDA

line is stable LOW during the HIGH period of the

acknowledge related clock pulse (set-up and hold times

must be taken into consideration).

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

Fig.17 4-bit transfer example.

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