SH7721 datasheet(603/1524 Pages) RENESAS

Part #	SH7721

Description	Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

PDF	1524 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 15

16-Bit Timer Pulse Unit (TPU)

Rev. 3.00 Jan. 18, 2008 Page 541 of 1458

REJ09B0033-0300

(2)

Examples of Phase Counting Mode Operation

In phase counting mode, TCNT counts up or down according to the phase difference between two

external clocks. There are four modes, according to the count conditions.

(a)

Phase counting mode 1

Figure 15.15 shows an example of phase counting mode 1 operation, and table 15.8 summarizes

the TCNT up/down-count conditions.

TCNT value

Time

Down-count

Up-count

TPU_TI2A (channel 2)

TPU_TI3A (channel 3)

TPU_TI2B (channels 2)

TPU_TI3B (channels 3)

Figure 15.15

Example of Phase Counting Mode 1 Operation

Table 15.8

Up/Down-Count Conditions in Phase Counting Mode 1

TPU_TI2A (Channel 2)

TPU_TI3A (Channel 3)

TPU_TI2B (Channel 2)

TPU_TI3B (Channel 3)

Operation

High level

Up-count

Low level

High level

Down-count

Low level

High level

Low level

[Legend]

: Rising edge

: Falling edge

SH7721 Datasheet(PDF) 603 Page - Renesas Technology Corp