HD64F3670 Datasheet, PDF (162/323 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

TCNT value
H'FFFF
GRA
GRB
H'0000
FTIOA
FTIOB
Time
Toggle output
Toggle output
Figure 11.5 Toggle Output Example (TOA = 0, TOB = 1)
Figure 11.6 shows another example of toggle output when TCNT operates as a periodic counter,
cleared by compare match A. Toggle output is selected for both compare match A and B.
TCNT value
H'FFFF
GRA
GRB
H'0000
FTIOA
FTIOB
Counter cleared by compare match with GRA
Time
Toggle
output
Toggle
output
Figure 11.6 Toggle Output Example (TOA = 0, TOB = 1)
The TCNT value can be captured into a general register (GRA, GRB, GRC, or GRD) when a
signal level changes at an input-capture pin (FTIOA, FTIOB, FTIOC, or FTIOD). Capture can
take place on the rising edge, falling edge, or both edges. By using the input-capture function, the
pulse width and periods can be measured. Figure 11.7 shows an example of input capture when
both edges of FTIOA and the falling edge of FTIOB are selected as capture edges. TCNT operates
as a free-running counter.
Rev. 2.0, 03/02, page 138 of 298