HD64F3039F18 Datasheet, PDF (261/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 8 16-Bit Integrated Timer Unit (ITU)
φ
External
clock input
TCNT input
TCNT
N–1
N
N+1
Figure 8.18 Count Timing for External Clock Sources (when Both Edges are Detected)
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
1. 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
1
(TIOCA or TIOCB). An output compare pin outputs
0 until the first compare match occurs.
Set output timing
2 2. Set a value in GRA or GRB to designate the
compare match timing.
Start counter
3 3. Set the STR bit to 1 in TSTR to start the timer
counter.
Waveform output
Figure 8.19 Setup Procedure for Waveform Output by Compare Match (Example)
Rev.3.00 Mar. 26, 2007 Page 237 of 682
REJ09B0353-0300