SN32F280 Series
32-Bit Cortex-M0 Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 72
Version 1.1
The processor state and registers, peripheral registers, and internal SRAM values are maintained and the logic levels of
the pins remain static.
The pins of Port 2 configured as ADC input channel must be set as input mode, inactive (no pull-down/pull-up resistor
enabled, Schmitt trigger disabled, Data register keep low) with
GPIO2_MODE
and
GPIO2_CFG
register by program to
avoid current leakage.
Wake up the chip from Sleep mode by an interrupt occurs.
The RESET pin has keep functionality in Sleep mode.
The Sleep mode is entered by using the following steps:
1. Write 4 to
2. Execute ARM Cortex-M0 WFI instruction.
4.3.2 DEEP-SLEEP MODE
In Deep-sleep mode, the system clock to the ARM Cortex-M0 core is stopped, and execution of instructions is
suspended.
The clock to the peripheral functions are stopped because the power state of oscillators are powered down, the clock
source are stopped, except RTC or LCD
low speed clock source (ELS X’TAL, ILRC) if used.
Note:
User SHALL decide to power down low speed clock source (ELS X’TAL, ILRC oscillator) or not
if RTC or LCD is enabled.
The processor state and registers, peripheral registers, and internal SRAM values are maintained and the logic levels of
the pins remain static.
All GPIO pins are served as wakeup pins. The user must program the GPIO registers for each pin to set the appropriate
edge polarity for the corresponding wakeup event, only edge sensitive is supported to wakeup MCU. The system will
exit Deep-sleep mode when GPIO indicates a GPIO interrupt to the ARM core. Furthermore, the interrupts
corresponding to each input must be enabled in the NVIC.
The RESET pin has keep functionality in Deep-sleep mode.
The Deep-sleep mode is entered by using the following steps:
1. Write 2 to
2. Execute ARM WFI instruction.
The advantage of the Deep-sleep mode is that can power down clock generating blocks such as oscillators and PLL,
thereby gaining far greater dynamic power savings over Sleep mode. In addition, the Flash can be powered down in
Deep-sleep mode resulting in savings in static leakage power, however at the expense of longer wake-up times for the
Flash memory.
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