ST40RA datasheet(54/94 Pages) STMICROELECTRONICS

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ADCS 7260755H

STMicroelectronics

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ST40RA

7 Electrical specifications

7.7

General purpose peripheral bus (EMI) AC specifications

Figure 14: EMI AC timings

Symbol

Parameter

Min

Max

Units

Note

tECHECH

EMI reference clock period

a. EMI reference clock is defined as the time when ECLKOUT, MCLKOUT and FCLKOUT are all valid.

tECHECL

EMI reference clock high time

tECLECH

EMI reference clock low period

tECHCH

EMI reference clock high to all clocks high

tECLCL

EMI reference clock low to all clocks low

tECHEOV

EMI reference clock high to output signals valid

tECLEOV

EMI reference clock low to output signals valid

tECHEOZ

EMI reference clock high to outputs tri-state

tECHEON

EMI reference clock high to outputs on

tEIVECH

Input signals valid to EMI reference clock high

b. Including EWAIT signal

tECHEIX

Input signals hold after EMI reference clock high

Table 28: EMI AC timings

Tri-state outputs

Outputs switched on full cycle

tECHLON

tECHLOZ

Inputs

tECHEIX

tECHECH

tECHECL

tRCLRCH

tECHEOV

tEIVECH

Outputs switched on 1/2 cycle

tECLEOV

FCLKOUT

tECHCH

tECLCL

ECLKOUT

MCLKOUT

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