PICDEMPIC18 datasheet(28/38 Pages) MICROCHIP

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PICDEM™ PIC18 Explorer Demonstration Board User’s Guide

DS51721B-page 24

3. Clock

Once this mode is entered from the main menu, a Real-Time Clock (RTC) will start

counting from 00:00:00. The Timer1 module uses a 32-kHz clock crystal to establish

the clock.

The program also sends the time data to the RS-232 serial port using the Universal

Asynchronous Receiver Transmitter (UART) on the microcontroller. This enables the

host PC to display the LCD’s data using the Hyper Terminal application on the PC.

If using the Hyper Terminal application, use the settings given in Table 3-1.

To set the clock time:

Enter the clock-setting program by pressing RB0. The clock begins running.

To set the hours value, press RA5.

Increment the hours to the desired value by pressing RB0.

To set the minutes value, press RA5.

Increment the minutes to the desired value by pressing RB0.

To start the clock with the set time, press RA5. The LCD returns to an active clock

display.

To return to the main menu, press RB0.

Note:

For information on connecting the board’s RS-232 serial port to the PC, see

Section 2.5 “Connecting to Host PC for RS-232 Communication”.

TABLE 3-1:

HYPER TERMINAL SETTINGS

Field

Setting

Bits per second

9600

Data bits

Parity

None

Stop bits

Flow control

None

PICDEMPIC18 데이터시트(PDF) 28 Page - Microchip Technology