SN8A1702AX datasheet(48/112 Pages) SONIX

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Preliminary

SN8P1702A/SN8P1703A

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

SONiX TECHNOLOGY CO., LTD

Page 48

Revision 0.5

SYSTEM MODE DESCRIPTION

OVERVIEW

The chip is featured with low power consumption by switching around three different modes as following.

High-speed mode

Low-speed mode

Power-down mode (Sleep mode)

Green mode

In actual application, the user can adjust the chip’s controller to work in these three modes by using OSCM register. At

the high-speed mode, the instruction cycle (Fcpu) is Fosc/4. At the low-speed mode and 3V, the Fcpu is 16KHz/4.

NORMAL MODE

In normal mode, the system clock source is external high-speed clock. After power on, the system works under normal

mode. The instruction cycle is fosc/4. When the external high-speed oscillator is 3.58MHz, the instruction cycle is

3.58MHz/4 = 895KHz. All software and hardware are executed and working. In normal mode, system can get into

power down mode and slow mode.

SLOW MODE

In slow mode, the system clock source is internal low-speed RC clock. To set CLKMD = 1, the system switch to slow

mode. In slow mode, the system works as normal mode but the slower clock. The system in slow mode can get into

normal mode and power down mode. To set STPHX = 1 to stop the external high-speed oscillator, and then the system

consumes less power.

GREEN MODE

The green mode is a less power consumption mode. Under green mode, there are only TC0 still counting and the other

hardware stopping. The external high-speed oscillator or internal low-speed oscillator is operating. To set CPUM1 = 1

and CPUM0 = 0, the system gets into green mode. To set TC0GN = 1 (bit 1 of T0M) will enable TC0 green mode

wakeup function. The system can be waked up to last system mode by TC0 timer timeout and P0 trigger signal.

The green mode provides a time-variable wakeup function. Users can decide wakeup time by setting TC0 timer. There

are two channels into green mode. One is normal mode and the other is slow mode. In normal mode, the TC0 timer

overflow time is very short. In slow mode, the overflow time is longer. Users can select appropriate situation for their

applications. Under green mode, the power consumption is 5u amp in 3V condition.

POWER DOWN MODE

The power down mode is also called sleep mode. The chip stops working as sleeping status. The power consumption

is very less almost to zero. The power down mode is usually applied to low power consuming system as battery power

productions. To set CUPM0 = 1, the system gets into power down mode. The external high-speed and low-speed

oscillators are turned off. The system can be waked up by P0, P1 trigger signal.

SN8A1702AX Scheda tecnica(PDF) 48 Page - SONiX Technology Company