PCF2119FUSLASH2SLASHF2 datasheet(22/79 Pages) NXP

22 / 79 page

PCF2119X_5

Product data sheet

Rev. 05 — 13 August 2009

22 of 79

NXP Semiconductors

PCF2119x

LCD controllers/drivers

9.3 CGRAM

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

(CGRAM). Some CGRAM characters (see Figure 21) are also used to drive icons:

• 6 CGRAM characters if icons blink and both icon rows are used in the application

• 3 CGRAM characters if no icons blink but both icon rows are used in the application

• 0 CGRAM characters if no icons are driven by the icon rows

When the icons blink option is enabled, double the number of CGRAM characters are

used since both the on and off state of an icon is deﬁned.

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

reserved for the CGRAM (see Figure 9 to Figure 14).

Figure 15 shows the addressing principle for the CGRAM.

(1) Character code bit 0 to bit 3 correspond to CGRAM address bit 3 to bit 6.

(2) CGRAM address bit 0 to bit 2 designate the 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. Lines are numbered from 0 to 7.

(3) Character pattern column positions correspond to CGRAM data bit 0 to bit 4, as shown in Figure 9 to Figure 14.

(4) As shown in Figure 9 to Figure 14, CGRAM character patterns are selected when character code bit 4 to bit 7 are all logic 0.

CGRAM data = logic 1 corresponds to selection for display.

(5) Only bit 0 to bit 5 of the CGRAM address are set by the Set_CGRAM command. Bit 6 can be set using the Set_DDRAM

command in the valid address range or by using the auto-increment feature during CGRAM write. All bits from bit 0 to bit 6 can

be read using the BF_AC instruction.

Fig 15. Relationship between CGRAM addresses, data and display patterns

coa072

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

(4)

(1)

(5)

(2)

(3)

PCF2119FU/2/F2 Datasheet(PDF) 22 Page - NXP Semiconductors

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