Functional Description; Cpu And Internal Memory; External Flash; Crystal Oscillators - Wiznet WizFi320 User Manual

WizFi320 User Manual

3. Functional Description

This chapter describes the modules and functions integrated in WizFi320.

3.1 CPU and Internal Memory

ESP32-DOWD-V3 contains two low-power Xtensa® 32-bit LX6 microprocessors. The
internal memory includes:
• 448 KB of ROM for booting and core functions.
• 520 KB of on-chip SRAM for data and instructions.
• 8 KB of SRAM in RTC, which is called RTC FAST Memory and can be used for data
storage; it is
accessed by the main CPU during RTC Boot from the Deep-sleep mode
• 8 KB of SRAM in RTC, which is called RTC SLOW Memory and can be accessed by
the co- processor during the Deep-sleep mode
• 1 Kbit of eFuse: 256 bits are used for the system (MAC address and chip
configuration) and the remaining m768 bits are reserved for customer applications,
including flash-encryption and chip- ID.

3.2 External Flash

WizFi320 integrates a 4 MB SPI flash, which is connected to GPIO6, GPIO7, GPIO8,
GPIO9, GPIO10 and GPIO11 of ESP32.

3.3 Crystal Oscillators

The module uses a 40-MHz crystal oscillator.

3.4 RTC and Low-Power Management

With the use of advanced power-management technologies, ESP32 can switch between
different power modes. For details on ESP32's power consumption in different
power modes, please refer to section "RTC and Low-Power Management".
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