Memory Maps and Addresses
CPCI-6200 Installation and Use (6806800J66C
)
172
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 (
μ
s) x (1 / Reference clock frequency in MHz)
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 0, the time to the
first interrupt may be longer or shorter than expected. The rollover time for the counter is 71.6
minutes with the default 1 MHz reference clock.
7.4.27.4 Counter Registers
Tick Timer 1 Counter Register–0xF202_0018 (32 bits)
Tick Timer 2 Counter Register–0xF202_0028 (32 bits)
Tick Timer 3 Counter Register–0xF202_0038 (32 bits)
Tick Timer 4 Counter Register–0xF202_0048 (32 bits)
When enabled, the tick timer counter register increments with the reference clock value.
Software may read or write the counter at any time.
Table 7-57 Tick Timer Counter Register
Bit
Field
Operation
Reset
31:0
Tick Timer Counter Value
R/W
0
Summary of Contents for CPCI-6200
Page 14: ...CPCI 6200 Installation and Use 6806800J66C 14 List of Figures ...
Page 20: ...CPCI 6200 Installation and Use 6806800J66C About this Manual 20 About this Manual ...
Page 28: ...Introduction CPCI 6200 Installation and Use 6806800J66C 28 ...
Page 44: ...Hardware Preparation and Installation CPCI 6200 Installation and Use 6806800J66C 44 ...
Page 70: ...Controls LEDs and Connectors CPCI 6200 Installation and Use 6806800J66C 70 ...
Page 106: ...MOTLoad Firmware CPCI 6200 Installation and Use 6806800J66C 106 ...
Page 178: ...Memory Maps and Addresses CPCI 6200 Installation and Use 6806800J66C 178 ...
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