pcf8813 NXP Semiconductors, pcf8813 Datasheet - Page 33

• Manufacturer Part Number: pcf8813
• Description: 67 + 1 X 102 Pixels Matrix Lcd Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
11.10 Free programmable multiplex rate
The free programmable multiplex rate concept allows the
user to limit the number of rows selected to groups of eight.
Any, or all of these groups of rows can be enabled or
disabled. The mask register command (M[7:0]) allows the
user to turn-on or turn-off blocks of eight rows.
Each mask value controls a block of eight rows, thus in
partial mode the maximum number of rows available is
64 plus the icon row. A logic 1 in the mask register enables
the rows available within that block of rows, and a logic 0
disables them.
The mask register causes the row counter to count eight
bits and then jump to the next enabled 8-bit group. For
example, if the mask register value is 00001101, then the
rows available will be 0 to 7, 16 to 23, 24 to 31 and 67.
Table 14 Examples of display normal driving mode and partial display driving mode
2004 Mar 05
N/P = 1 (the mask value is don’t care when N/P = 1 because all rows are enabled)
N/P = 0
(67 + 1)
MASK REGISTER
M0
M1
M2
M3
M4
M5
M6
M7
M0
M1
M2
M3
M4
M5
M6
M7
not available in mask register
not available in mask register
not available in mask register
102 pixels matrix LCD driver
MASK VALUE
1
0
0
1
0
0
0
1
1
0
0
1
0
0
0
1
33
Rows 8 to 15 and 32 to 63 have been skipped. This
information is also mapped to the RAM so that only the
contents of active rows are displayed.
Table 13 Range of free programmable multiplex rates
ROW SEQUENCE
MASK REGISTER
67 (icon row)
67 (icon row)
16 to 23
24 to 31
32 to 39
40 to 47
48 to 55
56 to 63
64 to 66
16 to 23
24 to 31
32 to 39
40 to 47
48 to 55
56 to 63
8 to 15
8 to 15
0 to 7
0 to 7
M0
M1
M2
M3
M4
M5
M6
M7
battery status: XXX
address book
connection time
network: YYY
reception strength
2 June; 15:25
keyboard locked
battery status: XXX
network: YYY
keyboard locked
R0 to R7 + icon row
R8 to R15 + icon row
R16 to R23 + icon row
R24 to R31 + icon row
R32 to R39 + icon row
R40 to R47 + icon row
R48 to R55 + icon row
R56 to R63 + icon row
NORMAL DISPLAY
ROWS AVAILABLE
Product specification
PCF8813