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EM6680WP27 Datasheet(PDF) 5 Page - EM Microelectronic - MARIN SA |
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EM6680WP27 Datasheet(HTML) 5 Page - EM Microelectronic - MARIN SA |
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5 / 58 page  R EM6680 Copyright © 2005, EM Microelectronic-Marin SA 5 www.emmicroelectronic.com 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 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"). START-UP RESET ACTIVE or running mode STAND-BY or HALT mode Clocks active SLEEP POWER-ON Power-On-Reset & Power Check Level POR static level Power-Check Active RC oscilator running 8 oscillator periods reset synchronizer and Power-Check 8 CPU clock periods Reset-pad WDreset PORwPC PORwPC PORwPC PORwPC Everything stopped Registers and RAM keep their value HALT instruction interrupt/event Sleep bit set SleepResCnt WakeUp on Change resetPortA WDreset |
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