STM8S207MB datasheet(77/103 Pages) STMICROELECTRONICS

77 / 103 page

STM8S207xx, STM8S208xx

Electrical characteristics

Doc ID 14733 Rev 12

77/103

10.3.8

SPI serial peripheral interface

Unless otherwise specified, the parameters given in Table 42 are derived from tests

performed under ambient temperature, fMASTER frequency and VDD supply voltage

conditions. tMASTER = 1/fMASTER.

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

characteristics (NSS, SCK, MOSI, MISO).

Table 42.

SPI characteristics

Symbol

Parameter

Conditions

Min

Max

Unit

fSCK

1/tc(SCK)

SPI clock frequency

Master mode

MHz

Slave mode

tr(SCK)

tf(SCK)

SPI clock rise and fall time

Capacitive load: C = 30 pF

tsu(NSS)

(1)

NSS setup time

Slave mode

4 x tMASTER

th(NSS)

(1)

NSS hold time

Slave mode

tw(SCKH)

(1)

tw(SCKL)

(1)

SCK high and low time

Master mode

tSCK/2 - 15

tSCK/2 + 15

tsu(MI)

(1)

tsu(SI)

(1)

Data input setup time

Master mode

Slave mode

th(MI)

(1)

th(SI)

(1)

Data input hold time

Master mode

Slave mode

ta(SO)

(1)(2)

Data output access time

Slave mode

3 x tMASTER

tdis(SO)

(1)(3)

Data output disable time

Slave mode

tv(SO)

(1)

Data output valid time

Slave mode (after enable edge)

tv(MO)

(1)

Data output valid time

Master mode (after enable edge)

th(SO)

(1)

Data output hold time

Slave mode (after enable edge)

th(MO)

(1)

Master mode (after enable edge)

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

Min time is for the minimum time to drive the output and the max time is for the maximum time to validate the data.

Min time is for the minimum time to invalidate the output and the max time is for the maximum time to put the data in Hi-Z.

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