ST40RA datasheet(57/94 Pages) STMICROELECTRONICS

部件名	ST40RA

功能描述	32-bit Embedded SuperH Device

PDF	94 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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7 Electrical specifications

ST40RA

57/94

STMicroelectronics

ADCS 7260755H

7.10

Low power CLKIN AC specifications

The timings referenced in

Figure 17 refer to the case where CLKIN is directly clocked from an

external source. In this case care should be taken that the total load on the LPCLKOSC output is

<2pF.

Symbol

Parameter

Min

Nom

Max

Units

Notes

tLCLLCL

LPCLKIN period

32.678

kHz

a, b

a. Measured between corresponding points on consecutive falling edges.

b. Variation of individual falling edges from their nominal times.

LPCLKIN duty cycle

tLCr

LPCLKIN rise time

c, d

c. When driven by an external clock.

d. Transitions must be monotonic within the range VIH to VIL

tLCf

LPCLKIN fall time

3, 4

Table 31: LPCLKIN timings

Figure 17: CLKIN timings

VDDRTC * 0.8

VDDRTC * 0.2

tLCLLCL

90%

10%

tLCf

90%

10%

tLCr

VDDRTC * 0.5

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