Nrst Pin Characteristics; Table 53. Nrst Pin Characteristics; Figure 24. I/O Ac Characteristics Definition - STMicroelectronics STM32F042F4 Manual

STM32F042x4 STM32F042x6
OSPEEDRy
Symbol
(1)
[1:0] value
f
max(IO)out
t
f(IO)out
Fm+
t
r(IO)out
configuration
f
(4)
max(IO)out
t
f(IO)out
t
r(IO)out
- t
EXTIpw
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
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.
6.3.15

NRST pin characteristics

The NRST pin input driver uses the CMOS technology. It is connected to a permanent pull-
up resistor, R
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
Symbol Parameter
V NRST input low level voltage
IL(NRST)
V NRST input high level voltage
IH(NRST)
Table 52. I/O AC characteristics
Parameter
(3)
Maximum frequency
Output fall time
Output rise time
(3)
Maximum frequency
Output fall time
Output rise time
Pulse width of external
signals detected by the
EXTI controller
Figure 24.

Figure 24. I/O AC characteristics definition

.
PU
conditions.

Table 53. NRST pin characteristics

Conditions
DocID025832 Rev 5
(1)(2)
(continued)
Conditions
C = 50 pF, V ≥ 2 V
L DDIOx
C = 50 pF, V < 2 V
L DDIOx
-
Min
- -
- 0.445 V +0.398
DD
Electrical characteristics
Min Max
-
- 12
- 34
- 0.5
- 16
- 44
10
Typ Max
- 0.3 V +0.07
DD
(1)
- -
Unit
2 MHz
ns
MHz
ns
- ns
Unit
(1)
V
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