Datasheet

236
8021G–AVR–03/11
ATmega329P/3290P
(TOSC1) pin instead of a 32kHz crystal. See ”Asynchronous Operation of Timer/Counter2” on
page 152 for further details.
Before entering Power-down mode, Standby mode or ADC Noise Reduction mode with synchro-
nous LCD clock selected, the user have to disable the LCD. Refer to ”Disabling the LCD” on
page 239.
23.3.7 Display Blanking
When LCDBL is written to one, the LCD is blanked after completing the current frame. All seg-
ments and common pins are connected to GND, discharging the LCD. Display memory is
preserved. Display blanking should be used before disabling the LCD to avoid DC voltage
across segments, and a slowly fading image.
23.3.8 Port Mask
For LCD with less than 25/40 segment terminals, it is possible to mask some of the unused pins
and use them as ordinary port pins instead. Refer to Table 23-3 for details. Unused common
pins are automatically configured as port pins.