7721 datasheet(164/577 Pages) RENESAS

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7721 Datasheet(PDF) 164 Page - Renesas Technology Corp

Part #	7721

Description	16-BIT SINGLE-CHIP MICROCOMPUTER

PDF	577 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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164 / 577 page

TIMER A

7721 Group User’s Manual

8–45

8.6 Pulse width modulation (PWM) mode

Fig. 8.6.6 Operation example of 8-bit pulse width modulator

Count source

TAjIN pin’s

input signal

1 / fi ! (m+1) ! (28 –1)

PWM pulse output

from TAjOUT pin

Note: The above applies when the reload register’s high-order 8 bits (n) = “0216”

and low-order 8 bits (m) = “0216” and an external trigger (falling edge of TAjIN pin

input signal) is selected.

Timer Aj interrupt

request bit

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

fi: Frequency of count source

(f2, f16, f64, or f512)

The 8-bit prescaler counts the count source.

The 8-bit pulse width modulator counts the 8-bit prescaler’s underflow signal.

8-bit prescaler’s

underflow signal

1 / fi ! (m+1) ! (n)

1 / fi ! (m+1)

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