STM32MP153A datasheet(230/256 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32MP153A/D

230/256

DS12502 Rev 6

6.3.37

USART interface characteristics

Unless otherwise specified, the parameters given in Table 110 for USART are derived from

tests performed under the ambient temperature, fHCLK frequency and VDD supply voltage

conditions summarized in Table 110, with the following configuration:

•

Output speed is set to OSPEEDRy[1:0] = 10

•

Capacitive load C = 30 pF

•

Measurement points are done at CMOS levels: 0.5×VDD

Refer to Section 6.3.17: I/O port characteristics for more details on the input/output alternate

function characteristics (NSS, CK, TX, RX for USART).

Table 110. USART characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fCK

USART clock frequency

Master mode

USART2,3,6

12.5

MHz

Master mode

USART1

16.5

Slave mode

tsu(NSS)

NSS setup time

Slave mode

tker(2)+2

th(NSS)

NSS hold time

Slave mode

tw(CKH),

tw(CKL)

CK high and low time

Master mode

1/fCK/2 - 1

1/fCK/2

1/fCK/2 + 1

tsu(RX)

Data input setup time

Master mode

tker(2)+3

Slave mode

th(RX)

Data input hold time

Master mode

Slave mode

tv(TX)

Data output valid time

Slave mode

Master mode

0.5

th(TX)

Data output hold time

Slave mode

Master mode

1. Guaranteed by characterization results.

2. Tker is the usart_ker_ck_pres clock period defined in the product reference manual.

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