PCF8813 datasheet(10/72 Pages) PHILIPS

10 / 72 page

2004 Mar 05

Philips Semiconductors

Product speciﬁcation

(67 + 1)

× 102 pixels matrix LCD driver

PCF8813

7.9

DDRAM addressing

handbook, full pagewidth

MGU622

101

X address

icon data

Y address

MSB

LSB

MSB

LSB

MSB

LSB

Fig.4 Sequence of writing data bytes into the RAM.

Data is downloaded in bytes into the RAM matrix of the

PCF8813 as indicated in Fig.4. The display data RAM has

a matrix of 68 by 102 bits. The columns are addressed by

the X address pointer whilst the rows are addressed in

groups of 8 by the Y address pointer. However, there are

only three rows in bank 8 and one row in bank 10. There is

no bank 9. Thus the address ranges are: X = 0 to

101 (1100101) and Y = 0 to 8 and then 10 (1010). The

PCF8813 is limited to 102 columns by 68 rows,

addressing the RAM outside this area is not allowed.

Two different addressing modes are possible; horizontal

addressing and vertical addressing.

In the horizontal addressing mode (V = 0) the X address

increments after each byte. After the last X address

(X = 101), x wraps-around to 0 and Y increments to

address the next row (see Fig.5) until bank 8 is filled. In the

vertical addressing mode (V = 1) the Y address

increments after each byte. After the Y address (Y = 8),

there is Y wraparound to 0 and X increments to address

the next column (see Fig.6). After the very last address

(X = 101 and Y = 8) the address pointers wraparound to

address X = 0 and Y = 0 in both addressing modes.

Addressing in bank 10 is a special case as these RAM

locations are not automatically accessed. Bank 10 is

reserved for icons. Icon locations must be addressed

explicitly by setting the Y address pointer to 10. The

Y address pointer does not auto-increment when the

X address overﬂows or underﬂows (it stays in set to

bank 9). Writing icon data is independent of the horizontal

or vertical addressing (V-bit) but is affected by the Mirror X

(MX) and Mirror Y (MY) bits. MX and MY are described in

Sections 7.11 and 7.12.

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