HD6432138SW datasheet(341/1061 Pages) RENESAS

Part #	HD6432138SW

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

PDF	1061 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 11 16-Bit Free-Running Timer

Rev. 4.00 Jun 06, 2006 page 287 of 1004

REJ09B0301-0400

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.

HD6432138SW Datasheet(PDF) 341 Page - Renesas Technology Corp