PM9904BPD datasheet(10/22 Pages) SAMES

10 / 22 page

sames

PM9904BPD

10/22

http://www.sames.co.za

Figure 12: Mapping of a single character

Table 1: LCD display memory map

Table 2: LCD display memory map (continued)

COM1, 17

COM2, 18

COM3, 19

COM4, 20

Blank

T1, T2, T3, T4

Blank

Total

~ 1

~ 2

% Error

imp/KWh

Wh/imp

~ 3

LCD Pin

Address

COM1, 17

COM2, 18

COM3, 19

COM4, 20

LCD Pin

Address

Cos

Total

Com

Cost

COM1

COM2

COM3

COM4

Cosf

Total

Com

Cost

Pin36

Pin35

Pin2

Pin1

Pin32

Pin5

DR-01255

COLUMNS

Commands

The demonstration software uses a buffer in memory on the

PC to generate the complete display. The buffer is dumped to

the LCD driver device in one go. The data passed to the driver

IC is formatted with a starting address followed by the data for

all segments. The first 8 bits is interpreted as address byte and

the rest of the data is sequentially passed as data bytes. The

address counter on the driver IC is incremented every 8

clocks. The procedure is repeated until all of the LCD memory

is filled up.

Address

The address of the data is set up in the following manner

To write to the device the following address is passed:

1 0 A5 A4 A3 A2 A1 A0

Data

Data to the device is passed with MSB first

D7 D6 D5 D4 D3 D2 D1 D0

Were D7 and D3 map to pin VR[3] of driver and COM4 of LCD

Were D6 and D2 map to pin VR[2] of driver and COM3 of LCD

Were D5 and D1 map to pin VR[1] of driver and COM2 of LCD

Were D4 and D0 map to pin VR[0] of driver and COM1 of LCD

See SA8807A datasheet for more information.

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