h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 420
h8s-2635
Manufacturer Part Number
h8s-2635
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2635.pdf
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Section 10 16-Bit Timer Pulse Unit (TPU)
10.4.7
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.
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 10-8 shows the correspondence between external clock pins and channels.
Table 10-8 Phase Counting Mode Clock Input Pins
Example of Phase Counting Mode Setting Procedure: Figure 10-28 shows an example of the
phase counting mode setting procedure.
Rev. 6.00 Feb 22, 2005 page 360 of 1484
REJ09B0103-0600
Channels
When channel 1 or 5 is set to phase counting mode
When channel 2 or 4 is set to phase counting mode
Select phase counting mode
<Phase counting mode>
Phase counting mode
Phase Counting Mode
Figure 10-28 Example of Phase Counting Mode Setting Procedure
Start count
[1]
[2]
[1] Select phase counting mode with bits MD3 to
[2] Set the CST bit in TSTR to 1 to start the count
MD0 in TMDR.
operation.
A-Phase
TCLKA
TCLKC
External Clock Pins
B-Phase
TCLKB
TCLKD
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