EM6607 EM Microelectronic, EM6607 Datasheet - Page 9

• Manufacturer Part Number: EM6607
• Description: Ultra-low power microcontroller
• Manufacturer: EM Microelectronic

4
To initialize the EM6607, a system RESET must be executed. There are five methods of doing this:
(1)
(2)
(3)
(4)
(5)
During any of these RESET’s the STB/RST output pin is high.
Figure 6.
4.1
At power on, the built-in voltage regulator starts to follow the supply voltage until V
V
therefore counts the first 32768 oscillator clocks after power-on and holds the system in RESET. The system will consequently
remain in RESET for at least one second after power up.
After power up the Analogue Watchdog circuit monitors the oscillator. If it stops for any reason other then SLEEP mode, then a
RESET is generated and the STB/RST pin is driven high.
4.2
During active or STANDBY mode the RESET terminal has a debouncer to reject noise and therefore must be active high for at
least 2ms or 16ms (CLK = 32kHz) - software selectable by DebCK in CIRQD register. (See Table 37)
When cancelling sleep mode, the debouncer is not active (no clock), however, reset passes through an analogue filter with a
time constant of typical. 5µs. In this case Reset pin must be high for at least 10 µs to generate a system reset.
Copyright © 2005, EM Microelectronic-Marin SA
REG
which supplies the oscillator and this needs time to stabilise, Power-On-Reset with the oscillation detection circuit
Reset
Oscillation detection circuit
Reset Pin
Initial RESET from the oscillation detection circuit.
External RESET from the RESET PIN.
External RESET by simultaneous high input to terminals PA0..PA3.
(Combinations defined by metal option)
Watchdog RESET (software option).
Software Power-On-Reset by writing S0ftPOR bit in Option2 register to “1”
System reset generation
R
9
DD
becomes higher than V
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EM6607
REG
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