PCF8813 datasheet(33/72 Pages) PHILIPS

33 / 72 page

2004 Mar 05

Philips Semiconductors

Product speciﬁcation

(67 + 1)

× 102 pixels matrix LCD driver

PCF8813

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.

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

MASK REGISTER

ROWS AVAILABLE

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

Table 14 Examples of display normal driving mode and partial display driving mode

MASK REGISTER

MASK VALUE

ROW SEQUENCE

NORMAL DISPLAY

N/P=1 (the mask value is don’t care when N/P = 1 because all rows are enabled)

0 to 7

battery status: XXX

8 to 15

address book

16 to 23

connection time

24 to 31

network: YYY

32 to 39

reception strength

40 to 47

2 June; 15:25

48 to 55

56 to 63

keyboard locked

not available in mask register

64 to 66

not available in mask register

67 (icon row)

N/P=0

0 to 7

battery status: XXX

8 to 15

16 to 23

24 to 31

network: YYY

32 to 39

40 to 47

48 to 55

56 to 63

keyboard locked

not available in mask register

67 (icon row)

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