User's Manual

RYZ012 Multi-Standard Wireless Communication Module for Bluetooth 5 Low Energy and 802.15.4
R15UH0002EU0103 Rev.1.03 Page 27 of 206
Apr.21.21
3.3.5 Standby Mode
In Standby, only the PM module is active, while analog and digital modules including the retention SRAMs are powered down. The chip can be
triggered to Active mode by 32K Timer, IO pin or NRST pin. The time to switch to Active mode is 1ms or so.
3.3.6 Shutdown Mode
In Shutdown mode, all digital and analog modules are powered down, and the PM module is active. The chip can be triggered to Active mode
by the NRST pin. The time to switch to Active mode is estimated at 10ms.
3.3.7 Wakeup Sources
The wakeup sources available to return to active mode differ for the individual low power modes. An overview of the available wakeup sources
is given in Table 7.
Wakeup from idle mode is possible by interrupt from one of the active peripheral units or by reset, which is triggered by the NRST pin. GPIO
wakeup can be supported if the GPIO interrupt functionality is used.
Wakeup from Suspend, Deep Sleep, and Standby mode is done through a wakeup logic as illustrated below. GPIO wakeup, 32kHz Timer, and
Low Power Comparator wakeup can be enabled individually through bits in register
SCTL:WKUPEN. After wakeup, the lower four bits of register
SCTL:SSTATUS determine the source that triggered wakeup.
Each individual GPIO pin can be configured as wakeup pin through GPIOx:WKUPEN. The polarity of the wakeup signal is controlled
GPIOx:WKUPPOL. GPIO wakeup provides an optional glitch filter, controlled through bit SCTL:WKUPEN:IOFILT.
Figure 6. Wakeup Logic
Wakeup from Shutdown Mode is only supported through NRST.
3.3.8 Retention Registers
The RYZ012 provides eight registers
SCTL:RD0 to SCTL:RD7 which contents that are retained during all low-power modes except Shutdown
Mode. Registers
SCTL:RD0 to SCTL:RD4 are reset by System Reset, Watchdog Reset, and Power-On reset. Registers SCTL:RD5 to
SCTL:RD7 are reset by Power-On Reset only.