7906 datasheet(201/531 Pages) RENESAS

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PULSE OUTPUT PORT MODE

7906 Group User’s Manual Rev.2.0

9-20

9.4 Pulse output port mode operation

Fig. 9.4.1 Example of pulse output port mode operation (1)

9.4.2 Operation at internal trigger

➀ When the timer Ai (i = 0, 3) count start bit is set to “1,” the counter starts counting of a count source.

➁ The contents of the pulse output data bits of three-phase output data registers 0, 1 are output from the

corresponding pulse output pins at each underflow of timer Ai. While the pulse width modulation is

selected, the pulse width modulation is performed for “H” level output.

The timer reloads the contents of the reload register and continues counting.

➂ The timer Ai interrupt request bit is set to “1” when the counter underflows in ➁. The interrupt request

bit retains “1” until the interrupt request is accepted or it is cleared to “0” by software.

➃ Write the next output data into three-phase output data registers 0, 1 during a timer Ai interrupt routine

(or after the confirmation of a timer Ai interrupt request occurrence.)

Figures 9.4.1 to 9.4.3 show examples of pulse output port mode operations.

Contents of bits 3 to 0 of

three-phase output data register 0

RTP00 output

RTP01 output

RTP02 output

RTP03 output

Timer A0 interrupt

request bit

000016

Undefined ✽2

00112

01102

11002

10012

✽1

✽3

Starts counting

Starts pulse outputting

✽1

✽3

FFFF16

n : Reloaded value

✽1 : Written by software

✽2 : When avoiding undefined output in these terms (in other words, when stabilizing

these output level), be sure to follow the procedure “Processing of avoiding undefined

output before starting pulse output” in Figure 9.3.2.

✽3 : Cleared to “0” by an interrupt request acceptance or cleared by software.

The above applies when the following conditions are satisfied:

•Pulse mode 0 selected

•RTP00 to RTP03 selected

•No pulse width modulation

•Positive polarity

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