Hitachi H8/3664 Hardware Manual page 227

Table of Contents

Signal Output by Compare Match: Compare match A, B, C, or D can cause the output at the

FTIOA, FTIOB, FTIOC, or FTIOD pin to go to 0, go to 1, or toggle. Figure 12.7 shows an

example of the setup procedure for outputting signals by compare match.

Output setup

Select waveform output

Set output timing

Start counter

Signal output

Figure 12.7 Setup Procedure for Outputting Signals by Compare Match (Example)

Figure 12.8 shows an example of 0 and 1 output. TCNT operates as a free-running counter, 1

output is selected for compare match A, and 0 output is selected for compare match B. When the

signal is already at the selected output level, the signal level does not change at compare match.

Figure 12.8 0 and 1 Output (TOA = 0, TOB = 1)

1. Select the initial output value (0 or 1)

in TCRW and the compare match

output value (0, 1, or toggle) in TIOR.

The FTIO pin outputs the selected

initial value until the first compare

match occurs.

2. Set the compare match timing in GR.

3. Set the CST bit in TMRW to 1 to start

the timer counter.