Bouffalo Lab BL702 - Clock Source; Reset Source

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BL702/704/706 Reference Manual

EXT_RST_N

ana_powb

reg_ctrl _pwron _rst

reg_ctrl _sys_reset

cpu_porst_n

reg_ctrl _cpu_reset

ana_ext_pwr_rst_n

wdt _rst_src_n

cpu_rst_n

pwronrst_n

cpu_sys_rstreq_n

efuse_cpu_rst_dis

~pds_misc_rst

Mux

hreset_n

~pds_cpu_rst

efuse_autoload_done

~pds_soc_rst

Sync

ana_pwrst_n

nwdt_hreset_n

Fig. 2.1: Reset source

2.3 Clock source

The clock source includes:

• XTAL: External crystal oscillator clock, mainly supporting frequency 32MHz

• XTAL32K: external crystal oscillator clock, frequency 32KHz

• RC32M: RC oscillator clock, frequency 32MHz, provides calibration

• PLL: PLL clock, internal system high-speed clock, the highest frequency supports 144MHz

The clock control unit distributes the clock from the oscillator to the core and peripheral devices.

The system clock source, dynamic divider, clock configuration, and sleep use 32KHz clock can be selected to achieve

low-power clock management.

Peripheral clocks include: Flash, USB2.0, Ethernet, UART, I2C, I2S, SPI, PWM, IR-remote, QDEC, KeyScan, ADC,

DAC.

BL702/704/706 Reference Manual 27/ 375

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