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EM6620 Datasheet(PDF) 6 Page - EM Microelectronic - MARIN SA

Part No. EM6620
Description  Ultra Low Power Microcontroller with 4x8 LCD Driver
Download  56 Pages
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Maker  EMMICRO [EM Microelectronic - MARIN SA]
Homepage  http://www.emmicroelectronic.com
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EM6620 Datasheet(HTML) 6 Page - EM Microelectronic - MARIN SA

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EM6620
Copyright
© 2005, EM Microelectronic-Marin SA
6
www.emmicroelectronic.com
2. Operating modes
The EM6620 has two low power dissipation modes, standby and sleep. Figure 4 is a transition diagram for
these modes.
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 condition from port A to go into reset mode.
2.2 STANDBY Mode
Executing a HALT instruction puts the EM6620 into
standby mode. The voltage regulator, oscillator,
watchdog
timer,
LCD,
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
canceled by a RESET or an Interrupt request if
enabled.
2.3 SLEEP Mode
Writing to the Sleep bit in the RegSysCntl1 register
puts the EM6620 in sleep mode. The oscillator stops
and most functions of the EM6620 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, all other functions
are in reset state. SLEEP mode may be canceled only by the input reset combination from port A
.
Due to the cold-start characteristics of the oscillator, waking up from sleep mode may take some time to
guarantee stable oscillation. During sleep mode and the following start up the EM6620 is in reset state. Waking
up from sleep mode clears the Sleep flag but not the SleepEn bit. Inspecting the SleepEn allows to determine
if the EM6620 was powered up (SleepEn = "0") or woken from sleep mode (SleepEn = "1").
TAKE CARE !!! To quit sleep mode, one must be sure to have a suitable defined combination of port A inputs
for reset (see section 4.2). The Bit NoInpReset has no action during sleep mode.
Table 2.3.1 Shows the state of the EM6620 functions in STANDBY and SLEEP modes
FUNCTION
STANDBY
SLEEP
Oscillator
Active
Stopped
Oscillator supervisor
Active
Stopped
Instruction execution
Stopped
Stopped
Interrupt functions
Active
Stopped
Registers and flags
Retained
Reset
RAM data
Retained
Retained
Option registers
Retained
Retained
Timer/Counter's
Active
Reset
Logic watchdog
Active
Reset
I/O port B
Active
High Impedance, no pulls
Input port A
Active
NoInputRes = "0" for reset generation
Only active for Reset generation
NoInputRes = "X"
LCD
Active
Stopped (display off)
Voltage Level Detector
finishes on going measure, then stop
Stopped
Figure 4 Mode transition diagram
Active
Halt
instruction
Sleep bit
write
IRQ
Standby
Sleep
Reset=1
Reset=0
Reset=1
Reset=1
Reset


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