SN8F5708 datasheet(57/204 Pages) SONIX

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SN8F5708 Series

System Operating Mode

Datasheet Rev. 2.4

9.4 Wake up

Under STOP mode (sleep mode) or idle mode, program doesn’t execute. The wakeup trigger can

wake the system up to normal mode. The wakeup trigger sources are external trigger (P0/P1 level

change) and internal trigger (any interrupt in EAL = 1 & function interrupt enable). The wakeup

function builds in interrupt operation issued request flag and trigger system executing interrupt

service routine as system wakeup occurrence.

When the system is in STOP mode the high clock oscillator stops. When waked up from STOP mode,

MCU waits for 2048 external high-speed oscillator clocks + 5 internal low-speed oscillator clocks

and 64 internal high-speed oscillator clocks + 5 internal low-speed oscillator clocks as the wakeup

time to stable the oscillator circuit. After the wakeup time, the system goes into the normal mode.

The value of the external high clock oscillator wakeup time is as the following.

The Wakeup time = 1/Fosc * 2048 (sec) + 1/Flosc * 5 + high clock start-up time

Example: In STOP mode (sleep mode), the system is waked up. After the wakeup time, the system

goes into normal mode. The wakeup time is as the following.

The wakeup time = 1/Fosc * 2048 + 1/Flosc * 5 = 0.825 ms (Fosc = 4MHz)

The total wakeup time = 0.825 ms + oscillator start-up time

The value of the internal high clock oscillator RC type wakeup time is as the following.

The Wakeup time = 1/Fosc * 64 (sec) + 1/Flosc * 5 + high clock start-up time

Example: In STOP mode (sleep mode), the system is waked up. After the wakeup time, the system

goes into normal mode. The wakeup time is as the following.

The wakeup time = 1/Fosc * 64 + 1/Flosc * 5= 315 us (Fhosc = 32MHz)



Note: The high clock start-up time is depended on the VDD and oscillator type of

high clock.

Under STOP mode and green mode, the I/O ports with wakeup function are able to wake the

system up to normal mode. The wake-up trigger edge is level changing in rising edge or falling edge.

The Port 0 and Port 1 have wakeup function. Port 0 wakeup functions always enables, but the Port

1 is controlled by the P1W register.

P1W Register (0x91)

Bit

Field

Type

Initial

Description

7..0

P1nW

R/W

0: Disable P1.n wakeup functionality

1: Enable P1.n wakeup functionality

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