s908qc16vdse Freescale Semiconductor, Inc, s908qc16vdse Datasheet - Page 64

• Manufacturer Part Number: s908qc16vdse
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Computer Operating Properly (COP)
The COP counter is a free-running 6-bit counter preceded by the 12-bit system integration module (SIM)
counter. If not cleared by software, the COP counter overflows and generates an asynchronous reset
after 262,128 or 8176 BUSCLKX4 cycles; depending on the state of the COP rate select bit, COPRS, in
configuration register 1. With a 262,128 BUSCLKX4 cycle overflow option, the internal 12.8-MHz
oscillator gives a COP timeout period of 20.48 ms. Writing any value to location $FFFF before an overflow
occurs prevents a COP reset by clearing the COP counter and stages 12–5 of the SIM counter.
A COP reset pulls the RST pin low (if the RSTEN bit is set in the CONFIG1 register) for 32 × BUSCLKX4
cycles and sets the COP bit in the reset status register (RSR). See
5.3 I/O Signals
The following paragraphs describe the signals shown in
5.3.1 BUSCLKX4
BUSCLKX4 is the oscillator output signal. BUSCLKX4 frequency is equal to the crystal frequency, internal
oscillator frequency, or the RC-oscillator frequency.
5.3.2 STOP Instruction
The STOP instruction clears the SIM counter.
5.3.3 COPCTL Write
Writing any value to the COP control register (COPCTL) (see
counter and clears stages 12–5 of the SIM counter. Reading the COP control register returns the low byte
of the reset vector.
5.3.4 Power-On Reset
The power-on reset (POR) circuit in the SIM clears the SIM counter 4096 × BUSCLKX4 cycles after
power up.
5.3.5 Internal Reset
An internal reset clears the SIM counter and the COP counter.
5.3.6 COPD (COP Disable)
The COPD signal reflects the state of the COP disable bit (COPD) in the configuration register (CONFIG).
See
64
Chapter 4 Configuration Registers (CONFIG1 and
Service the COP immediately after reset and before entering or after exiting
stop mode to guarantee the maximum time before the first COP counter
overflow.
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.
MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 4
NOTE
NOTE
CONFIG2).
Figure
5.4 COP Control
5-1.
14.8.1 SIM Reset Status
Register) clears the COP
Freescale Semiconductor
Register.