如节 5.3.9 所示，MCU 已断电，因此必须在进入保持状态前配置从保持状态到仅 MCU 或运行状态的转换。与仅 MCU 状态类似，必须为 PMIC 设置 I2C_7 触发条件。本例中使用 TPS6594133A 上的 GPIO4 来从保持状态唤醒器件并进入运行状态。

Write 0x48:0x34:0xC0:0x3F // Set GPIO4 to WKUP1 (goes to ACTIVE state) 
Write 0x48:0x64:0x08:0xF7 // clear interrupt of gpio4, write to clear 
Write 0x48:0x4F:0x00:0xF7 // unmask interrupt for GPIO4 falling edge 
Write 0x48:0x86:0x00:0xFC // trigger the TO_RETENTION power sequence 
After the GPIO4 has gone low and the PMIC has returned to the ACTIVE state 
Write 0x48:0x86:0x03:0xFC // Set NSLEEPx bits for ACTIVE state 
Write 0x48:0x64:0x08:0xF7 // clear interrupt of gpio4 

本例中使用 TPS6594133A RTC 计时器来从保持状态唤醒器件并进入运行状态。

Write 0x48:0xC3:0x01:0xFE // Enable Crystal 
Write 0x48:0xC5:0x05:0xF8 // minute timer, enable TIMER interrupts 
Write 0x48:0xC2:0x01:0xFE // start timer, if the timer values are non-zero clear before starting 
Write 0x48:0x86:0x00:0xFC // trigger the TO_RETENTION power sequence 
After the RTC Timer interrupt has occurred and the PMIC has returned to the ACTIVE state 
Write 0x48:0x86:0x03:0xFC // Set NSLEEPx bits for ACTIVE state 
Write 0x48:0xC5:0x00:0xFB // disable timer interrupt, clear bit 2 
Write 0x48:0xC4:0x00:0xDF // clear timer interrupt, clear bit 5.