SN8A1702AX datasheet(50/112 Pages) SONIX

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Preliminary

SN8P1702A/SN8P1703A

8-bit micro-controller build-in 12-bit ADC

SONiX TECHNOLOGY CO., LTD

Page 50

Revision 0.5

SYSTEM MODE SWITCHING

Switch normal/slow mode to power down (sleep) mode.

CPUM0 = 1

B0BSET

FCPUM0

; Set CPUM0 = 1.

During the sleep, only the wakeup pin and reset can wakeup the system back to the normal mode.

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.

Note: To stop high-speed oscillator is not necessary and user can omit it.

Switch slow mode to normal mode (The external high-speed oscillator is still running)

B0BCLR

FCLKMD

;To set CLKMD = 0

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 10mS for

external clock stable.

B0BCLR

FSTPHX

; Turn on the external high-speed oscillator.

B0MOV

Z, #27

; If VDD = 5V, internal RC=32KHz (typical) will delay

@@:

DECMS

; 0.125ms X 81 = 10.125ms for external clock stable

JMP

;

B0BCLR

FCLKMD

; Change the system back to the normal mode

Example: Go into Green mode and enable TC0 wakeup function.

; Set TC0 timer wakeup function.

B0BCLR

FTC0IEN

; To disable TC0 interrupt service

B0BCLR

FTC0ENB

; To disable TC0 timer

MOV

A,#20H

;

B0MOV

TC0M,A

; To set TC0 clock = Fcpu / 64

MOV

A,#74H

B0MOV

TC0C,A

; To set TC0C initial value = 74H (To set TC0 interval = 10

ms)

B0BCLR

FTC0IEN

; To disable TC0 interrupt service

B0BCLR

FTC0IRQ

; To clear TC0 interrupt request

B0BSET

FTC0ENB

; To enable TC0 timer

B0BSET

FTC0GN

; To enable TC0 wakeup function

; Go into green mode

B0BCLR

FCPUM0

;To set CPUMx = 10

B0BSET

FCPUM1

Note: If TC0ENB = 0 or TC0GN = 0, TC0 will not wakeup from green mode to normal/slow mode function.

SN8A1702AX Datasheet(PDF) 50 Page - SONiX Technology Company

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