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Rabbit 6000 User’s Manual
digi.com
45
4.2 Dependencies
4.2.1 I/O Pins
The CLK, STATUS, /WDTOUT, and /BUFEN pins are controlled by GOCR. Each of these pins can be
used as general-purpose outputs by driving them high or low.
•
The CLK pin can output the peripheral clock, the peripheral clock divided by two, or be driven high or
low.
•
The STATUS pin can be active low during the first byte of each opcode fetch, active low during an
interrupt acknowledge, or driven high or low.
•
The /WDTOUT pin can be active low whenever the watchdog timer resets the device or driven low.
•
The /BUFEN pin can be active low during external I/O cycles, active low during data memory cycles,
or driven high or low.
The values in the battery-backed onchip-encryption RAM bytes are cleared if the signal on the SMODE
pins changes state.
4.2.2 Clocks
The periodic interrupt, real-time clock, watchdog timer, and secondary watchdog timer require the 32 kHz
clock.
4.2.3 Interrupts
The periodic interrupt is enabled in GCSR, and will occur every 488 µs. It is cleared by reading GCSR. It
can operate at Priority 1, 2, or 3.
The secondary watchdog interrupt will occur whenever the secondary watchdog is enabled and allowed to
count down to zero. It is cleared by restarting the secondary watchdog by writing 0x5F to WDTCR or writ-
ing a new timeout value to SWDTR. The secondary watchdog interrupt always occurs at Priority 3.
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