SN8P2200 Series
USB 1.1 Low-Speed 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 54
Version 1.7
5
SYSTEM OPERATION MODE
5.1
OVERVIEW
The chip is featured with low power consumption by switching around four different modes as following.
z
High-speed
mode
z
Low-speed
mode
z
Power-down mode (Sleep mode)
z
Green
mode
Power Down Mode
(Sleep Mode)
Slow Mode
Green Mode
Normal Mode
CLKMD = 1
CLKMD = 0
P0, P1 Wake-up Function Active.
USB Bus.
External Reset Circuit Active.
CPUM1, CPUM0 = 01.
CPUM1, CPUM0 = 10.
P0, P1 Wake-up Function Active.
T0 Timer Time Out.
USB Bus.
External Reset Circuit
Active.
P0, P1 Wake-up Function Active.
T0 Timer Time Out.
USB Bus.
External Reset Circuit Active.
System Mode Switching Diagram
Operating mode description
MODE NORMAL
SLOW
GREEN
POWER DOWN
(SLEEP)
REMARK
EHOSC
Running
By STPHX
By STPHX
Stop
IHRC
Running
By STPHX
By STPHX
Stop
ILRC
Running Running Running
Stop
EHOSC with
RTC
Running By
STPHX Running
Stop
IHRC with
RTC
Running By
STPHX Stop
Stop
ILRC with
RTC
Running Running
Stop
Stop
CPU instruction
Executing Executing
Stop
Stop
T0 timer
*Active
*Active
*Active
Inactive
* Active if T0ENB=1
TC0 timer
*Active
*Active
Inactive
Inactive
* Active if TC0ENB=1
Watchdog timer
By Watch_Dog
Code option
By Watch_Dog
Code option
By Watch_Dog
Code option
By Watch_Dog
Code option
Refer to code option
description
Internal interrupt
All active
All active
T0
All inactive
External interrupt
All active
All active
All active
All inactive
Wakeup source
-
-
P0, P1, T0
Reset
P0, P1, Reset
z
EHOSC:
External high clock
z
IHRC:
Internal high clock (16M RC oscillator)
z
ILRC:
Internal low clock (16K RC oscillator at 3V, 32K at 5V)