H8SLASH3028F datasheet(373/923 Pages) RENESAS

部件名	H8/3028F

功能描述	Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

PDF	923 Pages

Scroll/Zoom	100%

制造商	RENESAS [Renesas Technology Corp]

网页	http://www.renesas.com

标志

373 / 923 page

Rev. 2.00, 09/03, page 343 of 890

• 16TCNT count timing

 Internal clock source

Bits TPSC2 to TPSC0 in 16TCR select the system clock (

φ) or one of three internal clock

sources obtained by prescaling the system clock (

φ/2, φ/4, φ/8).

Figure 9.15 shows the timing.

Internal

clock

16TCNT input

clock

16TCNT

N – 1

N + 1

Figure 9.15 Count Timing for Internal Clock Sources

 External clock source

The external clock pin (TCLKA to TCLKD) can be selected by bits TPSC2 to TPSC0 in

16TCR, and the detected edge by bits CKEG1 and CKEG0. The rising edge, falling edge,

or both edges can be selected.

The pulse width of the external clock signal must be at least 1.5 system clocks when a

single edge is selected, and at least 2.5 system clocks when both edges are selected. Shorter

pulses will not be counted correctly.

Figure 9.16 shows the timing when both edges are detected.

External

clock input

16TCNT input

clock

16TCNT

N – 1

N + 1

Figure 9.16 Count Timing for External Clock Sources (when Both Edges are Detected)

H8/3028F 数据表(PDF) 373 Page - Renesas Technology Corp