Tick Timer 2 Compare Register; Tick Timer 2 Counter - Motorola MVME172 Programmer's Reference Manual

VMEchip2

Tick Timer 2 Compare Register

2
ADR/SIZ
BIT
NAME
OPER
RESET

Tick Timer 2 Counter

ADR/SIZ
BIT
NAME
OPER
RESET
2-70
31
The tick timer 2 counter is compared to this register. When they are equal,
an interrupt is sent to the local bus interrupter and the overflow counter is
incremented. If the clear-on-compare mode is enabled, the counter is also
cleared. For periodic interrupts, the following equation should be used to
determine the compare register value for a specific period.
compare register value = T ( s)
When programming the tick timer for periodic interrupts, the counter
should be cleared to zero by software and then enabled. If the counter does
not initially start at zero, the time to the first interrupt may be longer or
shorter than expected. Remember the rollover time for the counter is 71.6
minutes.
31
This is the tick timer 2 counter. When enabled, it increments every
microsecond. Software may read or write the counter at any time.
$FFF40058 (32 bits)
. . .
Tick timer 2 Compare Register
R/W
0 P
$FFF4005C (32 bits)
. . .
Tick timer 2 Counter
R/W
0 P
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