M68HC16 Z SERIES
SYSTEM INTEGRATION MODULE
USER’S MANUAL
5-25
The monitor does not check DSACK response on the external bus unless the CPU16
initiates a bus cycle. The BME bit in SYPCR enables the internal bus monitor for inter-
nal to external bus cycles. If a system contains external bus masters, an external bus
monitor must be implemented and the internal-to-external bus monitor option must be
disabled.
When monitoring transfers to an 8-bit port, the bus monitor does not reset until both
byte accesses of a word transfer are completed. Monitor time-out period must be at
least twice the number of clocks that a single byte access requires.
5.4.3 Halt Monitor
The halt monitor responds to an assertion of the HALT signal on the internal bus,
caused by a double bus fault. A flag in the reset status register (RSR) can indicate that
the last reset was caused by the halt monitor. Halt monitor reset can be inhibited by
the halt monitor enable (HME) bit in SYPCR. Refer to
for
more information.
5.4.4 Spurious Interrupt Monitor
During interrupt exception processing, the CPU16 normally acknowledges an interrupt
request, arbitrates among various sources of interrupt, recognizes the highest priority
source, and then acquires a vector or responds to a request for autovectoring. The
spurious interrupt monitor asserts the internal bus error signal (BERR) if no interrupt
arbitration occurs during interrupt exception processing. The assertion of BERR caus-
es the CPU16 to load the spurious interrupt exception vector into the program counter.
The spurious interrupt monitor cannot be disabled. Refer to
for further
information. For detailed information about interrupt exception processing, refer to
5.4.5 Software Watchdog
The software watchdog is controlled by the software watchdog enable (SWE) bit in
SYPCR. When enabled, the watchdog requires that a service sequence be written to
the software watchdog service register (SWSR) on a periodic basis. If servicing does
not take place, the watchdog times out and asserts the RESET signal.
Each time the service sequence is written, the software watchdog timer restarts. The
sequence to restart the software watchdog consists of the following steps:
• Write $55 to SWSR.
• Write $AA to SWSR.
Table 5-8 Bus Monitor Period
BMT[1:0]
Bus Monitor Time-Out Period
00
64 system clocks
01
32 system clocks
10
16 system clocks
11
8 system clocks
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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