HD6473032F16 Datasheet, PDF (397/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 10 16-Bit Integrated Timer Unit (ITU)
10.4.7 Phase Counting Mode
In phase counting mode the phase difference between two external clock inputs (at the TCLKA
and TCLKB pins) is detected, and TCNT2 counts up or down accordingly.
In phase counting mode, the TCLKA and TCLKB pins automatically function as external clock
input pins and TCNT2 becomes an up/down-counter, regardless of the settings of bits TPSC2 to
TPSC0, CKEG1, and CKEG0 in TCR2. Settings of bits CCLR1, CCLR0 in TCR2, and settings in
TIOR2, TIER2, TSR2, GRA2, and GRB2 are valid. The input capture and output compare
functions can be used, and interrupts can be generated.
Phase counting is available only in channel 2.
Sample Setup Procedure for Phase Counting Mode: Figure 10.43 shows a sample procedure
for setting up phase counting mode.
Phase counting mode
Select phase counting mode ¹
1. Set the MDF bit in TMDR to 1 to select
phase counting mode.
2. Select the flag setting condition with the
FDIR bit in TMDR.
3. Set the STR2 bit to 1 in TSTR to start
the timer counter.
Select flag setting condition ₂
Start counter
3
Phase counting mode
Figure 10.43 Setup Procedure for Phase Counting Mode (Example)
Rev. 3.00 Mar 21, 2006 page 367 of 814
REJ09B0302-0300