參數(shù)資料
型號(hào)： 68HC705PL4B
廠商： Motorola, Inc.
英文描述： 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述： 8位微控制器單元（MCU）。（8位微控制器）
文件頁(yè)數(shù)： 36/98頁(yè)
文件大?。?/td> 1019K
代理商： 68HC705PL4B
GENERAL RELEASE SPECIFICATION
April 30, 1998
MOTOROLA
5-4
RESETS
MC68HC05PL4
REV 2.0
Use the following formula to calculate the COP time-out period:
COP Time-out Period = (prescaler x 256 x 8)
÷
f
BUS
where prescaler is the Timer8 prescaler value
The clock input to the watchdog system is derived from the output of the Timer8,
therefore a reset or preset of Timer8 may affect the COP watchdog time-out
period.
The COP Watchdog reset will assert the pulldown device to pull the RESET pin
low for 3-4 cycles of the internal bus clock.
The COP reset can be enable or disable by the COPON bit in MISCR. The MISCR
is in
Figure 5-5
.
COPON — COP On
Since the COP Watchdog system is derived from the 8-bit Timer system, the
T8EN bit in the Timer8 Control and Status register (bit3 of $0D) must be set for
COPON bit to have any affect.
COPON can be set to enable the COP watchdog system. Once set, the watch-
dog system cannot be disabled other than by a power-on reset or external
reset. After a reset the COPON bit is cleared and the COP watchdog system is
disabled.
1 =
COP Watchdog enabled.
0 =
COP Watchdog disabled.
NOTE
The COP Watchdog system is not designed to operate in STOP mode, therefore it
should be disabled before entering STOP mode by clearing the COPON bit.
Entering STOP mode with COP watchdog enabled will cause an internal reset of
the MCU.
5.3.3 Illegal Address Reset
An opcode fetch from an address that is not in the ROM (locations $0E00–$1DFF
and $1FF0-$1FFF) or the RAM (locations $0020–$011F) generates an illegal
address reset. The illegal address reset will assert the pulldown device to pull the
RESET pin low for 3-4 cycles of the internal bus clock.
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
MICSR
$001C
RESET
R
W
IRQEN
IRQS
TCMPEN
TCAPEN
LED
COPON
POR
0
0
0
0
0
0
0
0
Figure 5-5. Miscellaneous Control and Status Register (MICSR)
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