SmartGPU2-LCD480X320Touch-CommandSet

SMART GPU 2 3.5” TOUCH

Command Set

2.10 RTC Real Time Clock Commands

The new Smart GPU 2 includes an embedded RTC Real Time Clock to support

full Time-Date calendar functions, also Data Logger applications that require a precise

timestamp.

The real-time clock is an independent timer that counts every second and keeps

information about date(day, month, year) and time(hours, minutes, seconds). The next

RTC Timer Functions enable full possibilities with the Smart GPU 2, as it is now more

complete than ever. User can create full real time Graphic User Interfaces and

Datalogger applications with clock-calendar functions with the accuracy that only a RTC

provides.

The SmartGPU 2 has an internal and ready to run RTC, however to lower

production costs, the RTC Crystal hasn’t been mounted on the board, a 32.768 Khz

Crystal can be soldered to the OSC32 external pads to enable full SmartGPU 2 RTC

support. Also to avoid the RTC lose time and date data each time main VCC power is

removed or shut down from the chip, a Standard 3V coin backup battery can be

connected to the pads noted as VBat and GND pin on the board, this way the RTC will

continuously running even the SmartGPU 2 chip is power off and RTC time and date

data will be conserved.

Please refer to “SmartGPU2LCD320x240datasheet.pdf” file for more

detailed information about RTC recommended circuit.

Briefly Summary of Commands in this section:

*All of Those next commands always begin with the byte ‘R’-52hex, as

they are RTC commands, followed by the next parameters/bytes.

• RTC Setup – 53hex ‘S’

• RTC Set/Get Time and Date – 50hex ‘P’