STM32F042F4 datasheet(77/117 Pages) STMICROELECTRONICS

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STM32F042x4 STM32F042x6

Electrical characteristics

Figure 24. I/O AC characteristics definition

6.3.15

NRST pin characteristics

The NRST pin input driver uses the CMOS technology. It is connected to a permanent pull-

up resistor, RPU.

Unless otherwise specified, the parameters given in the table below are derived from tests

performed under the ambient temperature and supply voltage conditions summarized in

Table 21: General operating conditions

Fm+

configuration

(4)

fmax(IO)out Maximum frequency(3)

CL = 50 pF, VDDIOx ≥ 2 V

-2

MHz

tf(IO)out

Output fall time

tr(IO)out

Output rise time

fmax(IO)out Maximum frequency(3)

CL = 50 pF, VDDIOx < 2 V

-0.5

MHz

tf(IO)out

Output fall time

tr(IO)out

Output rise time

-tEXTIpw

Pulse width of external

signals detected by the

EXTI controller

-10

1. The I/O speed is configured using the OSPEEDRx[1:0] bits. Refer to the STM32F0xxxx RM0091 reference manual for a

description of GPIO Port configuration register.

2. Guaranteed by design, not tested in production.

3. The maximum frequency is defined in Figure 24.

4. When Fm+ configuration is set, the I/O speed control is bypassed. Refer to the STM32F0xxxx reference manual RM0091

for a detailed description of Fm+ I/O configuration.

Table 52. I/O AC characteristics(1)(2) (continued)

OSPEEDRy

[1:0] value(1)

Symbol

Parameter

Conditions

Min

Max

Unit

Table 53. NRST pin characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL(NRST) NRST input low level voltage

0.3 VDD+0.07(1)

VIH(NRST) NRST input high level voltage

0.445 VDD+0.398(1)

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