SW1-SW16 datasheet(3/18 Pages) RENESAS

3 / 18 page

REJ05B0812-0120 Rev.1.20

2007.11

Page 3 of 18

M16C/26A Group

Sample Program (Electronic Desktop Calculator)

Operational Outline

Calculation results are shown on liquid crystal display.

The display shows the result of operation when calculation results are within 7 digits (from

−9999999 to 9999999) or “E” when

calculation results are equal to or more than 8 digits. For example, when you enter “1234  5678 =,” the display will show “6912.” Or

when you enter “1234567  8901234,” the display will show “E.”

When a key is depressed, the buzzer sounds.

Note: In this program, pressing two or more switches at the same time has no effect (i.e., ignored).

This function is materialized using the following microcomputer facilities:

• Timer A0 (timer mode, main 2 ms cycle)

This timer counts 2 milliseconds using the main clock of the microcomputer as the count source.

It is used as the basic timer of RSK_LIB.

Time management, key scan, and LCD display management are performed using this timer.

• Timer A1 (pulse modulation mode, buzzer output)

This timer outputs a waveform with different high and low pulse widths using the main clock of the microcomputer as the count

source.

It is used to sound a buzzer each time a key is touched.

SW1-SW16 数据表(PDF) 3 Page - Renesas Technology Corp