Datasheet > EM6680WS11

EM6680WS11

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
EMMICRO		微控制器
页数	文件大小	规格书
58页	1908K
描述
Ultra Low Power 8-pin Microcontroller

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EM6680WS11 数据手册

EM6680

2. Operating modes

The EM6680 can operate in three different modes of which 2 are low-power dissipation modes (Stand-By and

Sleep). The modes and transitions between them are shown in Figure 5.

1.) Active mode

2.) Stand-By mode

3.) Sleep mode

Figure 5. EM6680 operating mode transitions

POWER-ON

START-UP

Power-On-Reset & Power Check Level

POR static level

Power-Check Active

RC oscilator

running

PORwPC

8 oscillator

periods

PORwPC

RESET

reset synchronizer

and

PORwPC

resetPortA

WDreset

PORwPC

Power-Check

8 CPU clock

periods

Reset-pad

WDreset

SleepResCnt

WakeUp on

Change

SLEEP

Everything stopped

Registers and

STAND-BY

or HALT

mode

Clocks active

ACTIVE

or running

mode

HALT instruction

interrupt/event

RAM keep their value

Sleep bit set

2.1 ACTIVE Mode

The active mode is the actual CPU running mode. Instructions are read from the internal ROM and executed by

the CPU. Leaving the active mode: via the halt instruction to go into standby mode, writing the SLEEP bit to go

into Sleep mode or detecting the reset to go into reset mode.

2.2 STANDBY (Halt) Mode

Executing a HALT instruction puts the EM6680 into standby mode. The voltage regulator, oscillator, watchdog

timer, interrupts, timers and counters are operating. However, the CPU stops since the clock related to

instruction execution stops. Registers, RAM and I/O pins retain their states prior to STANDBY mode.

STANDBY is cancelled by a RESET or an Interrupt request if enabled.

2.3 SLEEP Mode

Writing to the Sleep bit in the RegSysCntl1 register puts the EM6680 in sleep mode. The oscillator stops and

most functions of the EM6680 are inactive. To be able to write to the Sleep bit, the SleepEn bit in

RegSysCntl2 must first be set to "1". In SLEEP mode only the voltage regulator is active to maintain the RAM

data integrity, the peripheral functions are stopped and the CPU is reset. SLEEP mode may be cancelled by

Wake/Up on change, external reset or by Sleep Reset Counter if any of them is enabled.

Waking up from sleep mode may takes some time to guarantee stable oscillation. Coming back from sleep

mode puts the EM6681 in reset state and as such reinitializes all registers to their reset value. Waking up from

sleep mode clears the Sleep flag but not the SleepEn bit. Inspecting the SleepEn allows to determine if the

EM6680 was powered up (SleepEn = "0") or woken from sleep mode (SleepEn = "1").

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