PCF8820 datasheet(13/60 Pages) PHILIPS

13 / 60 page

2000 Dec 07

Philips Semiconductors

Product speciﬁcation

× 101 Grey-scale/ECB colour dot matrix

LCD driver

PCF8820

7.17

DDRAM addressing

Data is written in 8-bit bytes into the display data RAM

matrix of the PCF8820 (see Figs 6 to 8). The display data

RAM comprises a matrix of 67

× 101 × 2 bits. The columns

are addressed by the address pointer. The address ranges

are: X = 0 to 100 (64H) and Y=0to16 (10H). It should be

noted that only 3 rows are addressed in bank 16.

Addresses outside these ranges are not allowed.

Bit MX (see Table 3) enables or disables horizontal

address space mirroring:

• When bit MX = 0, mirroring is disabled. The address

corresponds to Col0 (see Fig.7).

• When bit MX = 1, mirroring is enabled and address

X = 0 corresponds to Col0 (see Fig.8). Bit MX

determines how data is written to the RAM. If bit MX is

changed after writing data to the RAM, no change on the

display will be visible.

handbook, full pagewidth

MGT119

100

X address

Col0

LSB

MSB

Y address

Fig.7 RAM X-address format for mirroring disabled.

handbook, full pagewidth

MGT120

X address

Col0

LSB

MSB

Y address

100

Fig.8 RAM X-address format for mirroring enabled.

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