Rainbow-electronics ATmega3290P_V Manual de usuario descargar pdf (Pagina 231)

231

ATmega329/3290/649/6490

2552H–AVR–11/06

either Timer/Counter Oscillator or external clock, depending on EXCLK in ASSR. See

“Asynchronous operation of the Timer/Counter” on page 147 for further details.

• Bit 6 – LCD2B: LCD 1/2 Bias Select

When this bit is written to zero, 1/3 bias is used. When this bit is written to one, ½ bias is

used. Refer to the LCD Manufacture for recommended bias selection.

• Bit 5:4 – LCDMUX1:0: LCD Mux Select

The LCDMUX1:0 bits determine the duty cycle. Common pins that are not used are ordi-

nary port pins. The different duty selections are shown in Table 100.

Note: 1. 1/2 bias when LCD2B is written to one and 1/3 otherwise.

• Bits 3:0 – LCDPM3:0: LCD Port Mask

The LCDPM3:0 bits determine the number of port pins to be used as segment drivers.

The different selections are shown in Table 101. Unused pins can be used as ordinary

port pins.

Note: 1. LCDPM3 is reserved and will always read as zero in ATmega329/649.

Table 100. LCD Duty Select

LCDMUX1 LCDMUX0 Duty Bias COM Pin I/O Port Pin

0 0 Static Static COM0 COM1:3

0 1 1/2 1/2 or 1/3

(1)

COM0:1 COM2:3

101/31/2

or 1/3

(1)

COM0:2 COM3

111/41/2

or 1/3

(1)

COM0:3 None

Table 101. LCD Port Mask (Values in bold are only available in ATmega3290/6490)

LCDPM3 LCDPM2 LCDPM1 LCDPM0

I/O Port in Use as

Segment Driver

Maximum Number

of Segments

0 0 0 0 SEG0:12 13

0 0 0 1 SEG0:14 15

0 0 1 0 SEG0:16 17

0 0 1 1 SEG0:18 19

0 1 0 0 SEG0:20 21

0 1 0 1 SEG0:22 23

0 1 1 0 SEG0:23 24

0 1 1 1 SEG0:24 25

1 0 0 0 SEG0:26 27

1 0 0 1 SEG0:28 29

1 0 1 0 SEG0:30 31

1 0 1 1 SEG0:32 33

1 1 0 0 SEG0:34 35

1 1 0 1 SEG0:36 37

1 1 1 0 SEG0:38 39

1 1 1 1 SEG0:39 40

1 2 ... 226 227 228 229 230 231 232 233 234 235 236 ... 374 375

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