Rev. 1.00, 09/03, page 391 of 704
Table 13.9 Examples of TCR, TCSR, and TCORB Settings
Register Bit Abbreviation
Contents
Description
7 CMIEB
0
6 CMIEA
0
5 OVIE 0
Interrupts due to compare-match and
overflow are disabled
4, 3
CCLR1,
CCLR0
11
TCNT is cleared by the rising edge of the
external reset signal (inverse of the IVI
signal)
TCR of TMR1
2 to 0
CKS2 to
CKS0
101
TCNT is incremented on the rising edge
of the external clock (IHI signal)
0011
Not changed by compare-match B; output
inverted by compare-match A (toggle
output)
TCSR of TMR1
3 to 0
OS3 to OS0
1001
When TCORB < TCORA, 1 output on
compare-match B, 0 output on
compare-match A
TCORB of TMR1 H'03
(example)
Compare-match on the 4th (example) rise of the IHI signal after the
rise of the inverse of the IVI signal
0
1
2
3
4
5
TCNT
TCNT = TCORB (3)
IHI signal
IVI signal (PDC signal)
IVO signal
(without fall modification,
with IHI synchronization)
IVO signal
(with fall modification,
without IHI synchronization)
IVO signal
(with fall modification
and IHI synchronization)
Figure 13.13 Fall Modification and IHI Synchronization Timing Chart
13.4.6
Internal Synchronization Signal Generation (IHG/IVG/CL4 Signal Generation)
By using the timer connection, FRT, and TMRY, it is possible to automatically generate internal
signals (IHG and IVG signals) corresponding to the IHI and IVI signals. As the IHG signal is
synchronized with the rise of the IVG signal, the IHG signal period must be made a divisor of the
IVG signal period in order to keep it constant. In addition, the CL4 signal can be generated in
synchronization with the IHG signal. Figure 13.14 shows a block diagram for IHG signal
generation and figure 13.15 shows a block diagram for IVG signal generation.
Содержание H8S/2437
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