HD643303x Hitachi, HD643303x Datasheet - Page 254
HD643303x
Manufacturer Part Number
HD643303x
Description
Hitachi Microcomputer
Manufacturer
Hitachi
Datasheet
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8.4.7 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 8-43 shows a sample procedure for
setting up phase counting mode.
Select phase counting mode
Select flag setting condition
Figure 8-43 Setup Procedure for Phase Counting Mode (Example)
Phase counting mode
Phase counting mode
Start counter
1
2
3
239
1.
2.
3.
Set the MDF bit in TMDR to 1 to select
phase counting mode.
Select the flag setting condition with
the FDIR bit in TMDR.
Set the STR2 bit to 1 in TSTR to start
the timer counter.
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