PCF2116CUSLASH12 datasheet(17/64 Pages) PHILIPS

17 / 64 page

1997 Apr 07

Philips Semiconductors

Product speciﬁcation

LCD controller/drivers

PCF2116 family

Fig.11 Relationship between CGRAM addresses and data and display patterns.

handbook, full pagewidth

MGA800 - 1

654

321

654

321

432

higher

order

bits

lower

order

bits

lower

order

bits

higher

order

bits

lower

order

bits

higher

order

bits

000

001

010

011

100

101

110

111

000

001

010

011

100

101

110

111

000

001

000

001

000

001

000

111

000

111

000

111

000

111

000

100

101

110

character codes

(DDRAM data)

CGRAM

address

character patterns

(CGRAM data)

character

pattern

example 1

cursor

position

character

pattern

example 2

Character code bits 0 to 3 correspond to CGRAM address bits 3 to 6.

CGRAM address bits 0 to 2 designate character pattern line position. The 8th line is the cursor position and display is performed by logical OR with

the cursor. Data in the 8th line will appear in the cursor position.

Character pattern column positions correspond to CGRAM data bits 0 to 4, as shown in Fig.11 (bit 4 being at the left end).

As shown in Figs 8 and 11, CGRAM character patterns are selected when character code bits 4 to 7 are all logic 0. CGRAM data = logic 1

corresponds to selection for display.

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.

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