Datasheet

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STM32F745xx STM32F746xx Electrical characteristics
195
5.3.19 TIM timer characteristics
The parameters given in Table 60 are guaranteed by design.
Refer to Section 5.3.17: I/O port characteristics for details on the input/output alternate
function characteristics (output compare, input capture, external clock, PWM output).
5.3.20 RTC characteristics
5.3.21 12-bit ADC characteristics
Unless otherwise specified, the parameters given in Table 62 are derived from tests
performed under the ambient temperature, f
PCLK2
frequency and V
DDA
supply voltage
conditions summarized in
Table 17.
Table 60. TIMx characteristics
(1)(2)
1. TIMx is used as a general term to refer to the TIM1 to TIM12 timers.
2. Guaranteed by design.
Symbol Parameter
Conditions
(3)
3. The maximum timer frequency on APB1 or APB2 is up to 216 MHz, by setting the TIMPRE bit in the
RCC_DCKCFGR register, if APBx prescaler is 1 or 2 or 4, then TIMxCLK = HCLK, otherwise TIMxCLK =
4x PCLKx.
Min Max Unit
t
res(TIM)
Timer resolution time
AHB/APBx prescaler=1
or 2 or 4, f
TIMxCLK
=
216 MHz
1-
t
TIMxCLK
AHB/APBx
prescaler>4, f
TIMxCLK
=
108 MHz
1-
t
TIMxCLK
f
EXT
Timer external clock
frequency on CH1 to CH4
f
TIMxCLK
= 216 MHz
0
f
TIMxCLK
/2
MHz
Res
TIM
Timer resolution - 16/32 bit
t
MAX_COUNT
Maximum possible count
with 32-bit counter
--
65536 ×
65536
t
TIMxCLK
Table 61. RTC characteristics
Symbol Parameter Conditions Min Max
-f
PCLK1
/RTCCLK frequency ratio
Any read/write operation
from/to an RTC register
4-
Table 62. ADC characteristics
Symbol Parameter Conditions Min Typ Max Unit
V
DDA
Power supply
V
DDA
− V
REF+
< 1.2 V
1.7
(1)
-3.6V
V
REF+
Positive reference voltage 1.7
(1)
-V
DDA
V
V
REF-
Negative reference voltage - - 0 - V
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