pcf8535 NXP Semiconductors, pcf8535 Datasheet - Page 14

• Manufacturer Part Number: pcf8535
• Description: 65 X 133 Pixel Matrix Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7.15
Addressing of the RAM can be split into two parts: input
addressing and output addressing. Input addressing is
concerned with writing data into the RAM. Output
addressing is almost entirely automatic and taken care of
by the device, however, it is possible to affect the output
mode.
7.15.1
Data is downloaded byte wise into the RAM matrix of the
PCF8535 as indicated in Figs 6 to 10.
Table 8 Effect of X-RAM page pointer
2001 Nov 07
handbook, full pagewidth
65
X ADDRESS POINTER
Addressing
MSB
MSB
Banks 1 to 7 use
the entire byte
Bank 8 is only
1 bit deep and
uses the MSB
LSB
LSB
I
NPUT ADDRESSING
133 pixel matrix driver
125
126
127
0
1
2
0
1
4
:
:
X-RAM PAGE POINTER
icon data
Fig.6 RAM format, input addressing.
XM
0
0
0
0
0
0
1
1
1
:
:
0
XM 0 = 0
14
The display RAM has a matrix of 65
The columns are addressed by a combination of the
X address pointer and the X-RAM page pointer, whilst the
rows addressed in groups of 8 by the Y address pointer.
The X address pointer has a range of 0 to 127 (7FH).
Its range can be extended by the X-RAM page pointer
XM
The PCF8535 is limited to 133 columns by 65 rows,
addressing the RAM outside of this area is not allowed.
X address
ADDRESSED COLUMN
0
. The Y address pointer has a range of 0 to 8 (08H).
.. ..
MX = 0
C125
C126
C127
C128
C129
C132
C0
C1
C2
:
:
.. ..
ADDRESSED COLUMN
Product specification
XM 0 = 1
133 bits.
MX = 1
C132
C131
C130
PCF8535
C7
C6
C5
C4
C3
C0
MGS673
:
:
0
1
2
3
4
5
6
7
8