STM32F205RB 查看數據表（PDF） - STMicroelectronics

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STM32F205RB

ARM-based 32-bit MCU, 150DMIPs, up to 1 MB Flash/128+4KB RAM, USB OTG HS/FS, Ethernet, 17 TIMs, 3 ADCs, 15 comm. interfaces & camera

STMicroelectronics 

Description

STM32F20xxx

Figure 6.

Startup in regulator OFF: slow VDD slope

- power-down reset risen after VCAP_1/VCAP_2 stabilization

VDD

PDR=1.8 V

1.2 V

1.08 V

VCAP_1 /VCAP_2

time

PA0 tied to NRST

NRST

time

1. This figure is valid both whatever the internal reset mode (ON or OFF).

Figure 7.

Startup in regulator OFF: fast VDD slope

- power-down reset risen before VCAP_1/VCAP_2 stabilization

VDD

PDR=1.8 V

1.2 V

1.08 V

VCAP_1 /VCAP_2

time

PA0 asserted externally

NRST

time

2.2.17

Real-time clock (RTC), backup SRAM and backup registers

The backup domain of the STM32F20x devices includes:

● The real-time clock (RTC)

● 4 Kbytes of backup SRAM

● 20 backup registers

The real-time clock (RTC) is an independent BCD timer/counter. Dedicated registers contain

the second, minute, hour (in 12/24 hour), week day, date, month, year, in BCD (binary-coded

decimal) format. Correction for 28, 29 (leap year), 30, and 31 day of the month are

performed automatically. The RTC provides a programmable alarm and programmable

periodic interrupts with wakeup from Stop and Standby modes.

It is clocked by a 32.768 kHz external crystal, resonator or oscillator, the internal low-power

RC oscillator or the high-speed external clock divided by 128. The internal low-speed RC

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Doc ID 15818 Rev 9

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