AN2021 datasheet(36/39 Pages) STMICROELECTRONICS

部件名	AN2021

功能描述	The ST10F272B and ST10F272E are members of the STMicroelectronics

PDF	39 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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36 / 39 page

Electrical characteristics

AN2021

36/39

5.2.2

Hi-speed synchronous serial interface (SSC)

The maximum baudrate of the SSC in the ST10F272 is 8 Mbaud whereas it is 10 Mbaud in

the ST10F269. For CPU frequencies strictly higher than 32 MHz, the minimum value in the

SSCBR register (prescaler value) must not be lower than 2.

t28 CC

Address/Unlatched

CS hold after RD,

0 (no tF)

-5 + tF

(tF > 0)

-0 + tF

0 (no tF)

-5 + tF

(tF > 0)

-0 + tF

t39SR

Latched CS low to

valid data in

3 TCL - 19

+ 2tA + tC

3 TCL - 21

+ 2tA + tC

18.5 + 2tA

+ tC

16.5 +

2tA +

t82CC

Address setup to

RdCS, WrCS (with

RW delay)

2 TCL -

10.5 + 2tA

2 TCL - 11

+ 2tA

14.5 + 2tA

14 +

2tA

Table 21.

Demultiplexed bus timings (continued)

Symbol

Parameter

ST10F269

ST10F272

ST10F269

@fCPU = 40 MHz

ST10F272

@fCPU =

40 MHz

Min

Max

Min

Max

Min

Max

Min

Max

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