HD6432142 datasheet(369/1177 Pages) RENESAS

Part #	HD6432142

Description	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

PDF	1177 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 11 16-Bit Free-Running Timer

Rev. 4.00 Sep 27, 2006 page 325 of 1130

REJ09B0327-0400

11.3

Operation

11.3.1

FRC Increment Timing

FRC increments on a pulse generated once for each period of the selected (internal or external)

clock source.

Internal Clock

Any of three internal clocks (

φ/2, φ/8, or φ/32) created by division of the system clock (φ) can be

selected by making the appropriate setting in bits CKS1 and CKS0 in TCR. Figure 11.3 shows the

increment timing.

N – 1

FRC input

clock

FRC

Internal

clock

N + 1

Figure 11.3 Increment Timing with Internal Clock Source

External Clock

If external clock input is selected by bits CKS1 and CKS0 in TCR, FRC increments on the rising

edge of the external clock signal.

The pulse width of the external clock signal must be at least 1.5 system clock (

φ) periods. The

counter will not increment correctly if the pulse width is shorter than 1.5 system clock periods.

Figure 11.4 shows the increment timing.

HD6432142 Datasheet(PDF) 369 Page - Renesas Technology Corp