PCF88331 datasheet(27/112 Pages) PHILIPS

27 / 112 page

2003 Feb 14

Philips Semiconductors

Objective speciﬁcation

STN RGB - 132

× 132 × 3 driver

PCF8833

6.2.19

COLUMN ADDRESS SET

The display data RAM parameters xs and xe define the column address range of the display data RAM for writing data.

Parameters xs and xe are defined between 0 and 131 (83H), and xs must be smaller then xe.

Table 29 Column address set register bits

6.2.20

PAGE ADDRESS SET

The display data RAM parameters ys[7:0] and ye[7:0] define the page (row) address range of the display data RAM for

writing data. Parameters ys and ye are defined between 0 and 131 (83H), and ys must be smaller then ye.

Table 30 Page address set register bits

6.2.21

MEMORY WRITE

Data written to the display memory (RAM) is validated by the Memory write (RAMWR) command. Entering this command

always returns the page address and column address to the start addresses xs[7:0] and ys[7:0] respectively. Content of

the display data RAM is written by the data entered following this command, with the page and/or column address

automatically incremented. The data Write mode turned on by this command can be automatically cancelled by entering

another command.

After a power-up the display RAM content is undefined. Neither a hardware reset nor a software reset changes the data

stored in display RAM. Sending display data must stop 160 ns before issuing a hardware reset, otherwise the last word

written to the display RAM may be corrupted.

Table 31 Memory write register bits

D/C

76543210

DEFAULT

000101010

2AH

xs[7]

xs[6]

xs[5]

xs[4]

xs[3]

xs[0]

02H

xe[7]

xe[6]

xe[5]

xe[4]

xe[3]

xe[2]

xe[1]

xe[0]

81H

D/C

76543210

DEFAULT

000111011

2BH

ys[7]

ys[6]

ys[5]

ys[4]

ys[3]

ys[0]

02H

ye[7]

ye[6]

ye[5]

ye[4]

ye[3]

ye[2]

ye[1]

ye[0]

81H

D/C

76543210

DEFAULT

000101101

2CH

D7D6D5D4D3D2D1D0

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