Datasheet

Section 13 8-Bit Timers (TMR)
Page 834 of 1408 R01UH0309EJ0500 Rev. 5.00
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
13.4.2 Reset Input
Figure 13.3 shows an example in which the 8-bit timer is used to generate a pulse output with a
selected delay in response to the TMRI input. The control bits are set as follows:
[1] The CCLR0 bit in TCR is set to 1 and the TMRIS bit in TCCR is set to 1 so that TCNT is
cleared at the high level of the TMRI input.
[2] In TCSR, bits OS3 to OS0 are set to B'0110, causing the output to change to 1 at a TCORA
compare match and to 0 at a TCORB compare match.
With these settings, the 8-bit timer provides output of pulses whose delay from the TMRI input is
determined by TCORA and the pulse width determined by (TCORB − TCORA).
TCORB
TCORA
H'00
TMRI
TMO
TCNT
Figure 13.3 Example of Reset Input