PCF2113AUSLASH10SLASHF4 datasheet(18/65 Pages) NXP

18 / 65 page

PCF2113_FAM_4

Product data sheet

Rev. 04 — 4 March 2008

18 of 65

NXP Semiconductors

PCF2113x

LCD controllers/drivers

8.11 Character generator RAM

Up to 16 user-deﬁned characters may be stored in the Character Generator RAM

(CGRAM). Some CGRAM characters (see Figure 18 and Figure 19) are also used to drive

icons (6 if icons blink and both icon rows are used in the application; 3 if no blink but both

icon rows are used in the application; 0 if no icons are driven by the icon rows). The

CGROM and CGRAM use a common address space, of which the ﬁrst column is reserved

for the CGRAM (see Figure 7, Figure 8, Figure 9 and Figure 10).

Figure 11 shows the addressing principle for the CGRAM.

8.12 Cursor control circuit

The cursor control circuit generates the cursor underline and/or cursor blink as shown in

Figure 12 at the DDRAM address contained in the address counter.

When the address counter contains the CGRAM address the cursor will be inhibited.

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

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

performed by logic OR with the cursor. Data in the 8th position appears in the cursor position.

Character pattern column positions correspond to CGRAM data bits 0 to 4, as shown in this ﬁgure.

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’ command. Bit 6 can be set using the ‘set DDRAM

address’ command in the valid address range 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 counter’ command.

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

mge995

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)

432

character code

(CGRAM data)

character

pattern

example 1

cursor

position

character

pattern

example 2

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