H8SLASH3021 datasheet(281/712 Pages) RENESAS

No. de pieza	H8/3021

Descripción Electrónicos	16-Bit Single-Chip Microcomputer

PDF	712 Pages

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Fabricante Electrónico	RENESAS [Renesas Technology Corp]

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8. 16-Bit Integrated Timer Unit (ITU)

Rev.2.00 Mar. 22, 2007 Page 257 of 684

REJ09B0352-0200

Example of Phase Counting Mode: Figure 8.44 shows an example of operations in phase

counting mode. Table 8.9 lists the up-counting and down-counting conditions for TCNT2.

In phase counting mode both the rising and falling edges of TCLKA and TCLKB are counted. The

phase difference between TCLKA and TCLKB must be at least 1.5 states, the phase overlap must

also be at least 1.5 states, and the pulse width must be at least 2.5 states. See figure 8.45.

TCNT2 value

Counting up

Counting down

Time

TCLKB

TCLKA

Figure 8.44 Operation in Phase Counting Mode (Example)

Table 8.9

Up/Down Counting Conditions

Counting Direction

Up-Counting

Down-Counting

TCLKB

High

Low

High

TCLKA

Low

High

Low

TCLKA

TCLKB

Phase

difference

Phase

difference

Pulse width

Overlap

Phase difference and overlap:

Pulse width:

at least 1.5 states

at least 2.5 states

Figure 8.45 Phase Difference, Overlap, and Pulse Width in Phase Counting Mode

H8/3021 Datasheet(PDF) 281 Page - Renesas Technology Corp

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