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TIMER A
5.4 Event counter mode
Quadruple processing
The timer up-counts all rising and falling edges to the TA4
the relationship that the TA4
input signal is "H" level.
The timer down-counts all rising and falling edges to the TA4
has the relationship that the TA4
pin's input signal is "H" level. (Refer to Figure 5.4.8.)
Table 5.4.3 lists the input signals to the TA4
selected.
TA4
TA4
Fig. 5.4.8 Quadruple processing
Table 5.4.3 TA4
and TA4
OUT
quadruple operation is selected
Input signal to TA4
"H" level
Up-count
"L" level
Rising
Falling
Down-count
"H" level
"L" level
Rising
Falling
5–28
pin's input signal level goes from "L" to "H" while the TA4
IN
IN
"H"
OUT
"L"
Up-count all edges
+1
+1
+1
"H"
IN
"L"
Up-count all edges
+1
+1
pins' input signals when
IN
pin Input signal to TA4
OUT
Rising
Falling
"L" level
"H" level
Falling
Rising
"H" level
"L" level
7751 Group User's Manual
pin's input signal level goes from "H" to "L" while the TA4
and TA4
OUT
IN
+1
+1
+1
+1
+1
pin
IN
and TA4
pins when the phase has
OUT
IN
and TA4
pins when the phase
OUT
IN
pins when the quadruple processing is
Down-count all edges
–1
–1
–1
–1
Down-count all edges
–1
–1
–1
–1
pin's
OUT
OUT
–1
–1
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