Technical data

MVME4100 Single Board Computer Programmer’s Reference (6806800H19B)

3.1.25.3 Compare Registers

The tick timer counter is compared to the Compare Register. When they are equal, the tick

timer interrupt is asserted and the overflow counter is incremented. If the clear-on-compare

mode is enabled the counter is also cleared. For periodic interrupts this equation should be

used to calculate the compare register value for a specific period (T):

Compare register value=T (us)

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. Note that the rollover time for the counter

is 71.6 minutes.

Table 3-30 Tick Timer Compare Registers

REG

Tick Timer 1 Compare Register - 0xF202 0014 (32 bits)

Tick Timer 2 Compare Register - 0xF202 0024 (32 bits)

Tick Timer 3 Compare Register - 0xF202 0034 (32 bits)

Tick Timer 4 Compare Register - 0xF202 0044 (32 bits)

BIT 31 … 0

Field Tick Timer Compare Value

OPER R/W

RESET 0