Artesyn MVME2502, Installation And Use Manual, Page: 129 / 164

Memory Maps and Registers
MVME2502 Installation and Use (6806800R96D)
129
Prescaler Adjust = 256-(CLKIN/CLKOUT)
CLKIN is the input clock source in MHz, and CLKOUT is the desired output clock reference in
MHz.
The prescaler provides the clock required by each of the three times. The tick timers require a
1 MHz clock input. The input clock to the prescaler is 25 MHz. The default value is set for
0x00E7, which gives 1 MHz reference clock for 25 MHz input clock source.
5.6.2 Control Registers
Table 5-25 Prescaler Register
REG Prescaler Register - 0xFFC80100
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Field RSVD RSVD RSVD RSVD RSVD RSVD RSVD RSVD Prescaler Register (8-bits)
OPER R/W
RESET 0x00e7
Table 5-26 Control Registers
REG
Tick Timer 0 Control Register - 0xFFC80202
Tick Timer 1 Control Register - 0xFFC80302
Tick Timer 2 Control Register - 0xFFC80402
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Field
RSVD RSVD RSVD RSVD RSVD
INTS CINT
ENINT
OVF
RSVD COVF
COC ENC
OPER R/W
RESET 0x0000