STK502 LCD Bit Mappings, Number Two, Number Three

Technical Specifications

4.1STK502 LCD Bit Mappings

The LCD Data Registers (LCDDRx) in the ATmega169 are organized in groups accord- ing to the use of Backplane Control Lines (also known as Common Lines). The LCD on the STK502 uses all four Common Lines and all 25 segments, in total 4 x 25 = 100 seg- ments. As can be seen in the LCD data sheet (Figure 4-1)describing the internal connection of pins, Common Lines and segments, the alphanumeric digits are referred to with a number according to where they are located on the LCD. Listed below is a description of the STK502 bit mappings according to this.

4.1.1Alphanumeric Digit The bit mappings for the alphanumeric digit number two are listed below.

Number Two

Table 4-1.Bit Mappings for LCD Alphanumeric Digit Number Two

Register Name	Bit7	Bit6	Bit5	Bit4	Bit3	Bit2	Bit1	Bit0

LCDDR0					2-K	1	S1	2-A

LCDDR5					2-J	2-F	2-H	2-B

LCDDR10					2-L	2-E	2-G	2-C

LCDDR15					2-M	2-P	2-N	2-D

4.1.2Alphanumeric Digit The bit mappings for the alphanumeric digit number three are listed below.

Number Three

Table 4-2.Bit Mappings for LCD Alphanumeric Digit Number Three

Register Name	Bit7	Bit6	Bit5	Bit4	Bit3	Bit2	Bit1	Bit0

LCDDR0	3-K	2	S2	3-A

LCDDR5	3-J	3-F	3-H	3-B

LCDDR10	3-L	3-E	3-G	3-C

LCDDR15	3-M	3-P	3-N	3-D

4.1.3Alphanumeric Digit The bit mappings for the alphanumeric digit number four are listed below.

Number Four

Table 4-3.Bit Mappings for LCD Alphanumeric Digit Number Four

Register Name	Bit7	Bit6	Bit5	Bit4	Bit3	Bit2	Bit1	Bit0

LCDDR1					4-K	S3	4	4-A

LCDDR6					4-J	4-F	4-H	4-B

LCDDR11					4-L	4-E	4-G	4-C

LCDDR16					4-M	4-P	4-N	4-D

4.1.4Alphanumeric Digit The bit mappings for the alphanumeric digit number five are listed below.

Number Five

Table 4-4.Bit Mappings for LCD Alphanumeric Digit Numer Five

Register Name	Bit7	Bit6	Bit5	Bit4	Bit3	Bit2	Bit1	Bit0

LCDDR1	5-K	S4	5	5-A

LCDDR6	5-J	5-F	5-H	5-B

LCDDR11	5-L	5-E	5-G	5-C

LCDDR16	5-M	5-P	5-N	5-D

STK502 User Guide

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