MC68HC708MP16CFU

Manufacturer Part NumberMC68HC708MP16CFU
ManufacturerFreescale Semiconductor, Inc
MC68HC708MP16CFU datasheet
 
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Page 335/398:

COPCTL Write

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The COP counter is a free-running 6-bit counter preceded by the 13-bit
system integration module (SIM) counter. If not cleared by software, the
COP counter overflows and generates an asynchronous reset after
18
2
period is 53.3 ms. Writing any value to location $FFFF before overflow
occurs clears the COP counter and prevents reset.
A COP reset pulls the RST pin low for 32 CGMXCLK cycles and sets the
COP bit in the SIM reset status register (SRSR) (see
Status
NOTE:
Place COP clearing instructions in the main program and not in an
interrupt subroutine. Such an interrupt subroutine could keep the COP
from generating a reset even while the main program is not working
properly.
16.4 I/O Signals
The following paragraphs describe the signals shown in
16.4.1 CGMXCLK
CGMXCLK is the crystal oscillator output signal. CGMXCLK frequency
is equal to the crystal frequency.
16.4.2 COPCTL Write
Writing any value to the COP control register (COPCTL) (see
Control
of the SIM counter. Reading the COP control register returns the reset
vector.
16.4.3 Power-On Reset
The power-on reset (POR) circuit in the SIM clears the SIM counter 4096
CGMXCLK cycles after power-up.
MC68HC708MP16
Rev. 3.1
Freescale Semiconductor
4
– 2
CGMXCLK cycles. With a 4.9152-MHz crystal, the COP timeout
Register).
Register) clears the COP counter and clears bits 12 through 4
Computer Operating Properly (COP)
Computer Operating Properly (COP)
7.7.3 SIM Reset
Figure
16-1.
16.5 COP
Technical Data
335