SN8P2624
8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 54 Version 0.3
5.2 SYSTEM MODE SWITCHING
¾ Example: Switch normal/slow mode to power down (sleep) mode.
B0BSET FCPUM0 ; Set CPUM0 = 1.
Note: During the sleep, only the wakeup pin and reset can wakeup the system back to the normal mode.
¾ Example: Switch normal mode to slow mode.
B0BSET FCLKMD ;To set CLKMD = 1, Change the system into slow mode
B0BSET FSTPHX ;To stop external high-speed oscillator for power saving.
¾ Example: Switch slow mode to normal mode (The external high-speed oscillator is still running)
B0BCLR FCLKMD ;To set CLKMD = 0
¾ Example: Switch slow mode to normal mode (The external high-speed oscillator stops)
If external high clock stop and program want to switch back normal mode. It is necessary to delay at least 20ms for
external clock stable.
B0BCLR FSTPHX ; Turn on the external high-speed oscillator.
B0MOV Z, #54 ; If VDD = 5V, internal RC=32KHz (typical) will delay
@@: DECMS Z ; 0.125ms X 162 = 20.25ms for external clock stable
JMP @B
B0BCLR FCLKMD ; Change the system back to the normal mode
¾ Example: Switch normal/slow mode to green mode.
B0BSET FCPUM1 ; Set CPUM1 = 1.
Note: If T0 timer wakeup function is disabled in the green mode, only the wakeup pin and reset pin can
wakeup the system backs to the previous operation mode.
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