PCF2119RU2DB2 datasheet(25/83 Pages) NXP

25 / 83 page

PCF2119X

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Product data sheet

Rev. 7 — 15 November 2010

25 of 83

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 22) 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 10 to Figure 15).

Figure 16 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 10 to Figure 15.

(4) As shown in Figure 10 to Figure 15, 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 16. Relationship between CGRAM addresses, data and display patterns

coa072

321

654

321

higher

order

bits

lower

order

bits

lower

order

bits

higher

order

bits

lower

order

bits

higher

order

bits

001

010

011

100

101

110

111

000

001

010

011

100

101

110

111

001

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)

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