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EM6520 Datasheet(PDF) 6 Page - EM Microelectronic - MARIN SA

Part No. EM6520
Description  MFP version of EM6620 Ultra Low Power Microcontroller 4x8 LCD Driver
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Maker  EMMICRO [EM Microelectronic - MARIN SA]
Homepage  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM6520 Datasheet(HTML) 6 Page - EM Microelectronic - MARIN SA

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EM6520
03/02 REV. D/449
Copyright
 2002, EM Microelectronic-Marin SA
6
www.emmicroelectronic.com
2
Operating modes
The EM6520 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 EM6520 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 EM6520 in sleep mode. The oscillator stops
and most functions of the EM6520 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 EM6520 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 EM6520 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 EM6520 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, Pull resistors
as defined
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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