SN8P1602A datasheet(44/76 Pages) SONIX

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SN8P1602B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 44

Version 1.1

SYSTEM MODE DESCRIPTION

OVERVIEW

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

High-speed mode

Low-speed mode

Power-down mode (Sleep mode)

Green mode

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.

From normal mode, the system can get into power down mode, slow mode and green mode.

SLOW MODE

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

slow mode. In slow mode, the system functions similar to the normal mode except using the internal RC clock. The

system in slow mode can switch back to high-speed normal mode. On the other hand, it can be easily switch to power

down mode and green mode for less power consumption.

GREEN MODE

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

are two paths into green mode. One is from normal mode and the other is from 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 around 5uA in 3V condition.

The system can be

waked up to last system mode by TC0 timer timeout and P0 trigger signal.

POWER DOWN MODE

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

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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