HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 671
HD6412373R
Manufacturer Part Number
HD6412373R
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412373R.pdf
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11.4.6
In phase counting mode, the phase difference between two external clock inputs is detected and
TCNT is incremented/decremented accordingly. This mode can be set for channels 1, 2, 4, and 5.
When phase counting mode is set, an external clock is selected as the counter input clock and
TCNT operates as an up/down-counter regardless of the setting of bits TPSC2 to TPSC0 and bits
CKEG1 and CKEG0 in TCR. However, the functions of bits CCLR1 and CCLR0 in TCR, and of
TIOR, TIER, and TGR are valid, and input capture/compare match and interrupt functions can be
used.
This can be used for two-phase encoder pulse input.
When overflow occurs while TCNT is counting up, the TCFV flag in TSR is set; when underflow
occurs while TCNT is counting down, the TCFU flag is set.
The TCFD bit in TSR is the count direction flag. Reading the TCFD flag provides an indication of
whether TCNT is counting up or down.
Table 11.31 shows the correspondence between external clock pins and channels.
Table 11.31 Clock Input Pins in Phase Counting Mode
Channels
When channel 1 or 5 is set to phase counting mode
When channel 2 or 4 is set to phase counting mode
Example of Phase Counting Mode Setting Procedure: Figure 11.24 shows an example of the
phase counting mode setting procedure.
Phase Counting Mode
Figure 11.24 Example of Phase Counting Mode Setting Procedure
Select phase counting mode
<Phase counting mode>
Phase counting mode
Start count
[1]
[2]
[1]
[2]
Select phase counting mode with bits MD3 to
MD0 in TMDR.
Set the CST bit in TSTR to 1 to start the count
operation.
Rev.7.00 Mar. 18, 2009 page 603 of 1136
Section 11 16-Bit Timer Pulse Unit (TPU)
A-Phase
TCLKA
TCLKC
External Clock Pins
B-Phase
TCLKB
TCLKD
REJ09B0109-0700
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