Rabbit 6000, User Manual

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Rabbit 6000 User’s Manual
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46
4.3 Operation
4.3.1 Periodic Interrupt
The following steps explain how a periodic interrupt is used.
1. Write the vector to the interrupt service routine to the internal interrupt table.
2. Enable the periodic interrupt by writing to GCSR.
3. The interrupt request is cleared by reading from GCSR.
A sample interrupt handler is shown below.
periodic_isr::
push af
ioi ld a, (GCSR) ; clear the interrupt request and get status
; handle any periodic tasks here
pop af
ipres
ret
4.3.2 Real-Time Clock
The real-time clock consists of six 8-bit registers that together comprise a 48-bit value. The real-time clock
is not synchronized to the read operation, so the least-significant byte should be read twice and checked for
matching values; if the two reads do not match, then the real-time clock may have been updating during
the read and should be read again.
Writing to RTC0R latches the current real-time clock value into the RTCxR holding registers, so the fol-
lowing sequence should be used to read the real-time clock.
1. Write any value to RTC0R and then read back a value from RTC0R.
2. Write a value to RTC0R again, and again read back a value from RTC0R.
3. If the two values do not match, repeat Step 2 until the last two readings are identical.
4. At this point, registers RTC1R through RTC6R can also be read and used.
Note that the periodic interrupt and the real-time clock are clocked by the same edge of the 32 kHz clock;
if read from the periodic interrupt, the count is guaranteed to be stable and only needs to be read once
(assuming it occurs within one clock of the 32 kHz clock).
The real-time clock can be reset by writing the sequence 0x40 – 0x80 to RTCCR. It can be reset and left in
the byte increment mode by writing 0x40 – 0xC0 to RTCCR and then writing bytes repeatedly to RTCCR
to increment the appropriate bytes of the real-time clock. The byte increment mode is disabled by writing
0x00 to RTCCR.