em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 138

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

EM78F648/644/642/641/548/544/542/541N
8-Bit Microcontroller
3
128 •
Address
Vdd = 5V, set up time period = 16.8ms ± 8%
Vdd = 3V, set up time period = 18ms ± 8%
0×0E
0×0F
0×10 ~
0×3F
R10~R3F
Name
IOCE
IOCF
(Continuation)
6.11.2 RESET & Wake-up for EM78F648/548N
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
oscillator start-up timer period) after a reset is detected. If the /Reset pin goes “low”
or WDT time-out is active, a RESET is generated. In RC mode the reset time is
34clocks, while in High XTAL mode, reset time is 2ms + 32clocks. In Low XTAL mode,
the reset time is 500ms. Once the RESET occurs, the following functions are
performed.
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.
The bits of the control register are set as indicated in the table on “Summary of the
Initialized Values for Registers.” shown below.
Bit Name
Power-on
/RESET and WDT
Wake-up from Pin
Change
Bit Name
Power-on
/RESET and WDT
Wake-up from Pin
Change
Bit Name
Power-on
/RESET and WDT
Wake-up from Pin
Change
Reset Type
CMP2IE
Bit 7
P
P
U
P
P
0
0
0
0
-
-
Bit 6
P
P
U
P
P
0
0
0
0
-
-
-
(This specification is subject to change without further notice)
TC3IE
SPIIE
Bit 5
P
P
U
P
P
0
0
0
0
-
PWMBIE PWMAIE
TC2IE
Product Specification (V1.0) 05.05.2010
Bit 4
P
P
U
P
P
0
0
0
0
-
TC1IE
Bit 3
P
P
U
P
P
0
0
0
0
-
UERRIE
Bit 2
EXIE
U
P
P
P
P
0
0
0
0
-
Bit 1
URIE
ICIE
P
P
U
P
P
0
0
0
0
-
3
(one
Bit 0
UTIE
TCIE
P
P
U
P
P
0
0
0
0
-