PCF8820U Philips Semiconductors, PCF8820U Datasheet - Page 13

• Manufacturer Part Number: PCF8820U
• Description: 67 x 101 Grey-scale/ECB colour dot matrix LCD driver
• Manufacturer: Philips Semiconductors

Philips Semiconductors
7.17
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
are addressed by the address pointer. The address ranges
are: X = 0 to 100 (64H) and Y = 0 to 16 (10H). It should be
noted that only 3 rows are addressed in bank 16.
Addresses outside these ranges are not allowed.
2000 Dec 07
handbook, full pagewidth
handbook, full pagewidth
67 101 Grey-scale/ECB colour dot matrix
LCD driver
DDRAM addressing
MSB
MSB
LSB
LSB
100
Col0
Col0
0
101
Fig.7 RAM X-address format for mirroring disabled.
Fig.8 RAM X-address format for mirroring enabled.
2 bits. The columns
13
X address
X address
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.
100
Product specification
0
Y address
Y address
16
16
0
0
MGT119
MGT120
PCF8820