STFPC311 datasheet(15/39 Pages) STMICROELECTRONICS

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STFPC311

4 Display RAM address and display mode

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Display RAM address and display mode

The display RAM stores the data transmitted from an external device to the STFPC311 through

the serial interface and is assigned addresses, in units of 8-bits see :Table 2.

Only the lower 4 bits of the addresses assigned to Seg17 through Seg20 are valid, the higher 4

bits are ignored.

Note:

The common grid/segment outputs are grid-based. The grid has to be enabled before any

segments can be turned on. If data is written for a segment before enabling its grid, there is

nothing on the display.

Table 2.

Assigned addresses

Seg1

Seg4

Seg8

Seg12

Seg16

Seg20

00 HL

00 HU

01 HL

01 HU

02 HL

DIG1

03 HL

03 HU

04 HL

04 HU

05 HL

DIG2

06 HL

06 HU

07 HL

07 HU

08 HL

DIG3

09 HL

09 HU

0A HL

0A HU

0B HL

DIG4

0C HL

0C HU

0D HL

0D HU

0E HL

DIG5

0F HL

0F HU

10 HL

10 HU

11 HL

DIG6

12 HL

12 HU

13 HL

13 HU

14 HL

DIG7

15 HL

15 HU

16 HL

16 HU

17 HL

DIG8

18 HL

18 HU

19 HL

19 HU

1A HL

DIG9

1B HL

1B HU

1C HL

1C HU

1D HL

DIG10

1E HL

1E HU

1F HL

1F HU

20 HL

DIG11

21 HL

21 HU

22 HL

22 HU

23 HL

DIG12

24 HL

24 HU

25 HL

25 HU

26 HL

DIG13

27 HL

27 HU

28 HL

28 HU

29 HL

DIG14

2A HL

2A HU

2B HL

2B HU

2C HL

DIG15

2D HL

2D HU

2E HL

2E HU

2F HL

DIG16

b3 b4

XX HL

XX HU

Lower 4 bits

Higher 4 bits

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