PCF8535 datasheet(25/52 Pages) PHILIPS

25 / 52 page

1999 Aug 24

Philips Semiconductors

Objective speciﬁcation

× 133 pixel matrix driver

PCF8535

7.16.2.5

Set X address

The X address is used as a pointer to the RAM for RAM

writing. The range of X is 0 to 127 (7FH) and may be

extended by the XM0 bit. The combined value of XM0 and

X address directly corresponds to the display column

number when MX = 0 and corresponds to the inverse

display column number when MX = 1; see Table 14.

Table 14 X address pointer

7.16.3

DISPLAY SETTING COMMAND PAGE

7.16.3.1

Display control

The D and E bits set the display mode as given in

Table 15.

Table 15 Display control

7.16.3.2

External display control

Mirror X and mirror Y have the effect of flipping the display

left to right or top to bottom respectively. MX works by

changing the order data that is written into the RAM.

As such, the effects of toggling MX will only be seen after

data is written into the RAM. MY works by reversing the

order that column data is accessed relative to the row

outputs. The effect of toggling MY will be seen

immediately. The behaviour of both of these bits is further

described in Section 7.15.

7.16.3.3

Bias system

BS[2:0] sets the bias system; see Section 7.10.

7.16.3.4

Display size

Physically large displays require stronger drivers. Bit IB

enables the user to select a stronger driving mode and

should be used if suitable display quality can not be

achieved with the default setting.

7.16.3.5

Multiplex rate

M[2:0] sets the multiplex rate; see Section 7.9.

7.16.4

HV-GEN COMMAND PAGE

7.16.4.1

HV-gen control

PRS

Programmable charge pump range select. This bit defines

whether the programmed voltage for VOP is in the low or

the high range. The behaviour of this bit is further

described in Section 7.13.

HVE

High voltage generator enable. When set to logic 0, the

charge pump is disabled. When set to logic 1, the charge

pump is enabled.

7.16.4.2

HV-gen stages

S[1:0] set the multiplication factor of the charge pump

ranging from times 2 to times 5. The behaviour of these

bits is further described in Section 7.14.

7.16.4.3

Temperature coefﬁcients

TC[2:0] set the required temperature coefficient.

The behaviour of these bits is further described in

Section 7.12.

7.16.4.4

Temperature measurement control

The SM bit is used to initiate a temperature measurement.

The SM bit is automatically cleared at the end of the

measurement. The behaviour of this bit is further

described in Section 7.11.

7.16.4.5

VLCD control

VOP[6:0] sets the required operating voltage for the

display.

XM0, X[6:0]

ADDRESSED

COLUMN, MX = 0

ADDRESSED

COLUMN, MX = 1

C132

C131

C130

C129

129

C129

130

C130

131

C131

132

C132

MODE

display blank

normal mode

all display segments on

inverse video

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