XC68HC705F32 Motorola, XC68HC705F32 Datasheet - Page 134

• Manufacturer Part Number: XC68HC705F32
• Description: MICROCONTROLLER
• Manufacturer: Motorola

14
Note:
14.1.4
The MCU contains a watchdog timer that automatically times out if not reset (cleared) within a
specific time by a program reset sequence.
If the COP watchdog timer is allowed to timeout, an internal reset is generated to reset the MCU.
Because the internal reset signal is used, the MCU comes out of a COP reset in the same
operating mode it was in when the COP timeout was generated.
The COP function is a mask option, enabled or disabled during device manufacture. See
Section
Refer to
14.1.5
The MCU contains a low voltage detection circuit which drives the external reset.
For a positive transition of supply voltage v
the V
above the V
RESET pin is pulled down.
MOTOROLA
14-2
RON
1.2.
Section 5.3
level. In this case the external reset pin is pulled down. If the supply voltage drops off
No RTS or RTI instruction should be placed at the end of a memory block since this
could result in an illegal address reset.
RON
Computer operating properly (COP) reset
Low voltage reset
level, the reset is released. If the supply voltage falls off below the V
for more information on the COP watchdog timer.
RESETS AND INTERRUPTS
DD
, the low voltage reset occurs as long as V
MC68HC05F32
ROFF
DD
level, the
is below
TPG