H8SLASH3021 datasheet(256/712 Pages) RENESAS

256 / 712 page

8. 16-Bit Integrated Timer Unit (ITU)

Rev.2.00 Mar. 22, 2007 Page 232 of 684

REJ09B0352-0200

Waveform Output by Compare Match: In ITU channels 0, 1, 3, and 4, compare match A or B

can cause the output at the TIOCA or TIOCB pin to go to 0, go to 1, or toggle. In channel 2 the

output can only go to 0 or go to 1.

• Sample setup procedure for waveform output by compare match

Figure 8.19 shows a sample procedure for setting up waveform output by compare match.

Output setup

Select waveform

output mode

Set output timing

Start counter

Waveform output

Select the compare match output mode (0, 1, or

toggle) in TIOR. When a waveform output mode

is selected, the pin switches from its generic input/

output function to the output compare function

(TIOCA or TIOCB). An output compare pin outputs

Set a value in GRA or GRB to designate the

compare match timing.

Set the STR bit to 1 in TSTR to start the timer

counter.

0 until the first compare match occurs.

Figure 8.19 Setup Procedure for Waveform Output by Compare Match (Example)

• Examples of waveform output

Figure 8.20 shows examples of 0 and 1 output. TCNT operates as a free-running counter, 0

output is selected for compare match A, and 1 output is selected for compare match B. When

the pin is already at the selected output level, the pin level does not change.

H8/3021 Datasheet(PDF) 256 Page - Renesas Technology Corp