em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 127

• Manufacturer Part Number: em78f644nso28s
• Description: Flash Series 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.0) 05.05.2010
(This specification is subject to change without further notice)
For EM78F648N/F548N:
6.10.5 Wake-up from Sleep Mode
6.11 RESET and Wake-up
6.11.1 RESET & Wake-up for EM78F644/642/641/544/542/541N
A RESET is initiated by one of the following events:
1) Power-on reset
2) /RESET pin input "low"
3) WDT time-out (if enabled)
The device is kept in a RESET condition for a period of approximately 18ms (one
oscillator start-up timer period) after a RESET is detected. Once a RESET occurs,
the following functions are performed.
CMP1IE, CMP2IE, and the “ENI” instruction execution must be enabled.
Interrupt occurs whenever a change occurs on the comparators output pins.
The actual change on the pins can be determined by reading the bit CP1OUT of
CMP1IF, CMP2IF, and the comparator interrupt flags, can only be cleared by
When enabled, the comparator remains active and the interrupt remains
If a mismatch occurs, the interrupt will wake up the device from Sleep mode.
The power consumption should be taken into consideration for the benefit of
If the function is not utilized during Sleep mode, turn off the comparator before
The oscillator is running, or will be started.
The Program Counter (R2) is set to all "0".
All I/O port pins are configured as input mode (high-impedance state).
The Watchdog timer and prescaler are cleared.
When power is switched on, the upper three bits of R3 are cleared.
The bits of RB, RC, RD registers are set to their previous status.
The bits of CONT register are set to all "0".
The bits of IOCA register are set to all "0".
R39 Bit 6 of Bank 0 for Comparator 1 and the bit CP2OUT of R3C Bit 6 of Bank 0
for Comparator 2.
software.
energy conservation.
going into Sleep mode.
functional, even under Sleep mode.
EM78F648/644/642/641/548/544/542/541N
8-Bit Microcontroller
• 117