PCF2104CUSLASH2 datasheet(23/56 Pages) MOTOROLA

23 / 56 page

1997 Dec 16

Philips Semiconductors

Product speciﬁcation

LCD controller/driver

PCF2104x

9.7

Set CGRAM address

‘Set CGRAM address’ sets bits 0 to 5 of the CGRAM

address (ACG in Table 3) into the Address Counter

(binary A[5] to A[0]). Data can then be written to or read

from the CGRAM.

Only bits 0 to 5 of the CGRAM address are set by the

‘Set CGRAM address’ instruction. Bit 6 can be set using

the ‘Set DDRAM address’ instruction or by using the

auto-increment feature during CGRAM write. All bits 0 to 6

can be read using the ‘Read busy flag and address’

instruction.

9.8

Set DDRAM address

Set DDRAM address sets the DDRAM address (ADD in

Table 3) into the Address Counter (binary A[6] to A[0).

Data can then be written to or read from the DDRAM.

Table 5

Hexadecimal address ranges

9.9

Read busy ﬂag and address

‘Read busy flag and address’ reads the Busy Flag (BF).

When BF = logic 1 it indicates that an internal operation is

in progress. The next instruction will not be executed until

BF = logic 0, so BF should be checked before sending

another instruction.

At the same time, the value of the Address Counter

expressed in binary A[6] to A[0] is read out. The Address

Counter is used by both CGRAM and DDRAM and its

value is determined by the previous instruction.

9.10

Write data to CGRAM or DDRAM

Writes binary 8-bit data D[7] to D[0] to the CGRAM or the

DDRAM.

Whether the CGRAM or DDRAM is to be written to is

determined by the previous specification of CGRAM or

DDRAM address setting. After writing, the address

automatically increments or decrements by 1, in

accordance with the entry mode. Only bits D0 to D4 of

CGRAM data are valid, bits D5 to D7 are ‘don't care’.

ADDRESS

FUNCTION

00 to 4F

1-line by 24

00 to 0B and 0C to 4F

2-line by 12

00 to 27 and 40 to 67

2-line by 24

00 to 13, 20 to 33, 40 to 53

and 60 to 73

4-line by 12

9.11

Read data from CGRAM or DDRAM

Reads binary 8-bit data D[7] to D[0] from the CGRAM or

DDRAM.

The most recent ‘Set address’ instruction determines

whether the CGRAM or DDRAM is to be read.

The ‘Read data’ instruction gates the content of the data

LOW again, internal operation increments (or decrements)

the AC and stores RAM data corresponding to the new AC

into the DR.

Remark: the only three instructions that update the data

• ‘Set CGRAM address’

• ‘Set DDRAM address’

• ‘Read data’ from CGRAM or DDRAM.

Other instructions (e.g. ‘Write data, ‘Cursor/display shift’,

‘Clear display’, ‘Return home’) will not modify the data

10 INTERFACE TO MICROCONTROLLER

(PARALLEL INTERFACE)

The PCF2104x 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 the 8-bit mode data is transferred as 8-bit bytes using

the 8 data lines DB0 to DB7. Three further 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 DB4 to DB7

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

bits (DB0 to DB3 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 15, 16 and 17 for examples of bus protocol.

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

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

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