DIGITAL-LOGIC MICROSPACE MSM286 Series Technical User's Manual page 54

DIGITAL-LOGIC AG
14 W
ATCHDOG PROGRAMMING
The LTC1232 device works as watchdog and power supervisory circuit. At the boot-time the watchdog
is disabled.
14.1 Watchdog on MSM286
Version 6.x of MSM286 board integrates also a watchdog.
Enable the Watchdog with:
If enabled, then write the strobe impulse to:
every 1 sec. or more often
15 T
HE POWER MANAGEMENT OF THE
The F8680 has sophisticated power management which features three power saving modes: drowse,
sleep and suspend. You can program which modes are active in the configuration BIOS-SETUP and
the F8680.EXE Setup tool.
DROWSE: Drowse uses the performance control feature of the F8680 CPU to reduce power con-
sumption. Performance control adds delays of 1 to 127 CPU clocks between each CPU
instruction cycle. The number of cycles is programmable through F8680.EXE tool with
the CREG 0Ah. The power saving arises from less memory and peripheral accesses
over time.
F8680 features used:
SLEEP: The processor enters the sleep mode by executing a HLT instruction in non-SuperState
R mode with interrupts enabled. The sleep mode is transparent to the BIOS, DOS and
any application programs because transitions out of sleep mode occur on any enabled
hardware interrupt or SuperState interrupt.
F8680 features used:
SUSPEND: The suspend mode occurs when the system is turned off except for the portions that
need to keep the critical information. The 32kHz oscillator continues to provide the clock
to the CPU's internal 32bit counter and provides the timing clock for memory refresh.
Upon resume, the OSCPWR signal is automatically turned on and the system begins
executing instructions where it left off (not a system reset).
F8680 features used:
Power Control Signals:
PUP: Power UP
/PON: Power ON
/POFF: Power OFF
(inactive the PON, POFF are high)
2A4 hex Bit 5 [0..7]
2ABh
Performance reduction technique
CPU clock divide
Halt of CPU clock
SuperState
Switch to suspend with Power OFF signal or with programm-
able time-out
Switch to resume with Power ON signal or with programmable
time-out
1 = Normal Mode
0= Sleep Mode
neg. pulse switch to normal mode
neg. pulse switch to sleep mode
54
MSM286 Manual V6.4
:
low = enabled
high = disabled
MSM286
MSE286 MSM286
available available
not implemented <--
not implemented <--