HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 601
HD6417320
Manufacturer Part Number
HD6417320
Description
Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
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15.4.5
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 2, and 3.
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 compare match and interrupt functions can be used.
The previous set value (initial output value set before the timer was started in phase counting
mode) is output from the TPU_TO pin in TIOR.
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 15.7 shows the correspondence between external clock pins and channels.
Table 15.7 Phase Counting Mode Clock Input Pins
Channels
When channel 2 is set to phase counting mode
When channel 3 is set to phase counting mode
Phase Counting Mode
A-Phase
TPU_TI2A
TPU_TI3A
Rev. 3.00 Jan. 18, 2008 Page 539 of 1458
Section 15
External Clock Pins
16-Bit Timer Pulse Unit (TPU)
B-Phase
TPU_TI2B
TPU_TI3B
REJ09B0033-0300
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