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Embedded Systems Design with the Atmel AVR Microcontroller Part II

Embedded Systems Design with the Atmel AVR Microcontroller Part II

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column<br />

select<br />

row select<br />

R6<br />

R0<br />

microcontroller<br />

column<br />

select<br />

row select<br />

C2:C1:C0<br />

5 VDC<br />

5 VDC<br />

Figure 7.11: Dot matrix display.<br />

C2<br />

C1<br />

C0<br />

R6<br />

R5<br />

R4<br />

R3<br />

R2<br />

R1<br />

R0<br />

3<br />

interface<br />

circuitry<br />

interface<br />

circuitry<br />

5 x 7 dot<br />

matrix display<br />

a) dot matrix display layout<br />

74HC137<br />

1:8 decoder<br />

5 x 7 dot matrix display<br />

b) dot matrix interface details<br />

7.4. OUTPUT DEVICES 203

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