Operation With Cascaded Connection - Hitachi H8/3062 Hardware Manual

φ
8TCNT
N
TCORB
N
Input capture signal
CMFB
Figure 9.15 CMFB Flag Setting Timing when Input Capture Occurs
Timing of Overflow Flag (OVF) Setting: The OVF flag in 8TCSR is set to 1 by the overflow
signal generated when 8TCNT overflows (from H'FF to H'00). Figure 9.16 shows the timing in
this case.
φ
8TCNT H'FF H'00
Overflow signal
OVF
Figure 9.16 Timing of OVF Setting
9.4.5

Operation with Cascaded Connection

If bits CKS2 to CKS0 are set to (100) in either 8TCR0 or 8TCR1, the 8-bit timers of channels 0
and 1 are cascaded. With this configuration, the two timers can be used as a single 16-bit timer
(16-bit timer mode), or channel 0 8-bit timer compare matches can be counted in channel 1
(compare match count mode). Similarly, if bits CKS2 to CKS0 are set to (100) in either 8TCR2 or
8TCR3, the 8-bit timers of channels 2 and 3 are cascaded. With this configuration, the two timers
can be used as a single 16-bit timer (16-bit timer mode),or channel 2 8-bit timer compare matches
can be counted in channel 3 (compare match count mode). In this case, the timer operates as
below.
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