PCA9620H NXP [NXP Semiconductors], PCA9620H Datasheet - Page 46

• Manufacturer Part Number: PCA9620H
• Description: Universal LCD driver for low multiplex rates
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCA9620
Product data sheet
7.9.2 Bank selection
In order to fill the whole RAM addresses 60 bytes need to be sent to the PCA9620. After
the last byte sent the data pointer is wrapped around to column 0 to start a possible RAM
content update (see
transmitted data byte can be written over the RAM boundary.
A RAM bank can be thought of as a collection of RAM rows. The PCA9620 includes a
RAM bank switching feature in the static, 1:2, and 1:4 multiplex drive modes.
The RAM bank switching gives the provision for preparing display information in an
alternative bank and to be able to switch to it once it is complete. Input and output banks
can be set independently from one another with the input-bank-select and the
output-bank-select commands;
Fig 39. Display RAM filling order in 1:8 multiplex drive mode
Fig 40. Data pointer wrap around in 1:8 multiplex drive mode
display RAM rows/
backplane outputs
(BP)
rows
All information provided in this document is subject to legal disclaimers.
display RAM
data pointer
0
1
2
3
4
5
6
7
b7
b6
b5
b4
b3
b2
b1
b0
0
Figure
Rev. 1 — 9 December 2010
1
2
display RAM columns/segment outputs (S)
40). In this case there is no situation possible where a
0
1
2
3
4
5
6
7
3
b7
b6
b5
b4
b3
b2
b1
b0
0
4
Figure 41
1
5
2
6
columns
3
7
4
shows the concept.
Universal LCD driver for low multiplex rates
5
wrap around
6
55 56 57 58 59
7
55 56 57 58 59
MSB
013aaa291
b7
b6
transmitted data byte
a7
a6
a5
a4
a3
a2
a1
a0
PCA9620
b5
© NXP B.V. 2010. All rights reserved.
b4
b3
b2
013aaa267
b1
46 of 71
LSB
b0