7721 datasheet(135/577 Pages) RENESAS

tên linh kiện	7721

Giải thích chi tiết về linh kiện	16-BIT SINGLE-CHIP MICROCOMPUTER

PDF	577 Pages

Scroll/Zoom	100%

nhà sản xuất	RENESAS [Renesas Technology Corp]

Trang chủ	http://www.renesas.com

Logo

135 / 577 page

TIMER A

7721 Group User’s Manual

8–16

8.3 Timer mode

(2)

Pulse output function

The pulse output function is selected by setting the pulse output function select bit (bit 2 at addresses

5816 to 5A16) to “1.” When this function is selected, the TAjOUT pin is forcibly set for the pulse output

pin regardless of the corresponding bits of the port P5 direction register. The TAjOUT pin outputs

pulses of which polarity is inverted each time a counter underflow occurs.

When the count start bit (address 4016) is “0” (count stopped), the TAjOUT pin outputs “L” level. Figure

8.3.6 shows an example of operation with the pulse output function selected.

Fig. 8.3.6 Example of operation selecting pulse output function

FFFF16

000016

Time

Count start bit

Timer Aj interrupt

request bit

n = Reload register’s contents

Cleared to “0” when interrupt request is accepted or cleared by software.

Set to “1” by software.

Starts counting.

Pulse output from

TAjOUT pin

Set to “1” by software.

Cleared to “0” by software.

Starts counting.

Restarts

counting.

7721 bảng dữ liệu(PDF) 135 Page - Renesas Technology Corp