SN8P1602AS datasheet(47/94 Pages) SONIX

47 / 94 page

SN8P1600

8-bit micro-controller

SONiX TECHNOLOGY CO., LTD

Page 47

Revision 1.94

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)

In actual application, user can adjust the MCU to work in one of these three modes by using OSCM register. At the

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

POWER DOWN MODE

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

is very less as zero. The power down mode is usually applied to power-saving system like battery-powered

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.

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