ST72321R7-Auto datasheet(211/243 Pages) STMICROELECTRONICS

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ST72321xx-Auto

Electrical characteristics

Doc ID 13829 Rev 1

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19.11

Communication interface characteristics

19.11.1

SPI (serial peripheral interface)

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

Refer to Section 19.8: I/O port pin characteristics for more details on the input/output

alternate function characteristics (SS, SCK, MOSI, MISO).

Table 132.

SPI characteristics

Symbol

Parameter

Conditions

Min

Max

Unit

fSCK

1/tc(SCK)

SPI clock frequency

Master, fCPU =8MHz

fCPU/128 = 0.0625

fCPU/4 = 2

MHz

Slave, fCPU =8MHz

fCPU/2 = 4

tr(SCK)

tf(SCK)

SPI clock rise and fall time

see I/O port pin description

tsu(SS)

(1)

SS setup time(2)

Slave

tCPU + 50

th(SS)

(1)

SS hold time

Slave

120

tw(SCKH)

(1)

tw(SCKL)

(1)

SCK high and low time

Master

Slave

100

tsu(MI)

(1)

tsu(SI)

(1)

Data input setup time

Master

Slave

100

th(MI)

(1)

th(SI)

(1)

Data input hold time

Master

Slave

100

ta(SO)

(1)

Data output access time

Slave

120

tdis(SO)

(1)

Data output disable time

Slave

240

tv(SO)

(1)

Data output valid time

Slave (after enable edge)

120

th(SO)

(1)

Data output hold time

tv(MO)

(1)

Data output valid time

Master (after enable edge)

120

tCPU

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 = 125 ns and tsu(SS) = 175 ns.

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