7702 Datasheet, PDF (116/522 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER

TIMER A
5.4 Event counter mode
qQuadruple processing
The timer up-counts all rising and falling edges to the TA4OUT and TA4IN pins when the phase has
the relationship that the TA4IN pin’s input signal level goes from “L” to “H” while the TA4OUT pin’s
input signal is “H” level.
The timer down-counts all rising and falling edges to the TA4OUT and TA4IN pins when the phase
has the relationship that the TA4IN pin’s input signal level goes from “H” to “L” while the TA4OUT
pin’s input signal is “H” level. (Refer to Figure 5.4.8.)
Table 5.4.3 lists the input signals to the TA4OUT and TA4IN pins when the quadruple processing is
selected.
“H”
TA4OUT
“L”
Up-count all edges
+1 +1 +1 +1 +1
“H”
TA4IN
“L”
Up-count all edges
+1 +1 +1 +1 +1
Fig. 5.4.8 Quadruple processing
Table 5.4.3 TA4OUT and TA4IN pins’ input signals when
quadruple operation is selected
Input signal to TA4OUT pin Input signal to TA4IN pin
Up-count
“H” level
“L” level
Rising
Falling
Rising
“L” level
Down-count
Falling
“H” level
“H” level
Falling
“L” level
Rising
Rising
“H” level
Falling
“L” level
Down-count all edges
–1 –1 –1 –1 –1
Down-count all edges
–1 –1 –1 –1 –1
5–28
7702/7703 Group User’s Manual