ST72561AR7-Auto datasheet(295/324 Pages) STMICROELECTRONICS

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ST72561-Auto

Electrical characteristics

Doc ID 12370 Rev 8

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20.12

Communication interface characteristics

20.12.1

SPI - serial peripheral interface

Subject to general operating conditions for VDD, fOSC, and TA unless otherwise specified.

Refer to I/O port characteristics for more details on the input/output alternate function

characteristics (SS, SCK, MOSI, MISO).

Table 120.

SPI characteristics

Symbol

Parameter

Conditions

Min

Max

Unit

fSCK =1 /tc(SCK) SPI clock frequency

Master, fCPU = 8 MHz

fCPU / 128 = 0.0625 fCPU /4 =2

MHz

Slave, fCPU =8 MHz

fCPU /2 =4

tr(SCK)

SPI clock rise and fall

time

See I/O port pin description

tf(SCK)

tsu(SS)

(1)

SS setup time(2)

Slave

(4 x TCPU)+ 50

th(SS)

(1)

SS hold time

120

tw(SCKH)

(1)

SCK high and low time

Master

100

tw(SCKL)

(1)

Slave

tsu(MI)

(1)

Data input setup time

Master

100

tsu(SI)

(1)

Slave

th(MI)

(1)

Data input hold time

Master

th(SI)

(1)

Slave

ta(SO)

(1)

Data output access time

Slave

120

tdis(SO)

(1)

Data output disable time

240

tv(SO)

(1)

Data output valid time

Slave (after enable edge)

th(SO)

(1)

Data output hold time

tv(MO)

(1)

Data output valid time

Master (after enable

edge)

120

th(MO)

(1)

Data output hold time

Data based on design simulation and/or characterization results, not tested in production.

Depends on fCPU. For example, if fCPU = 8 MHz, then TCPU =1/fCPU = 125ns and tsu(SS) = 550ns.

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