2.18
CPU Speed Selection
The PCM- 586 uses a Crystal controlled frequency synthesizer to control the CPU
clock rate. The jumper block at J13 allows for the selection of any 8 CPU base clock
frequencies ranging from 4 to 50 Mhz.
The table below gives all of the possible base CPU clock speeds available by jumpering
J13.
021402
OPERATIONS MANUAL PCM-586
Page 2-15
WinSystems
- "The Embedded Systems Authority"
6
o o
5
4
o o
3
2
o o
1
1
o o
2
J14
CPU Speed Select
Jumpers J13 and J14
J13
CPU
Speed
J13
1-2
J13
3-4
J13
5-6
4 Mhz
ON
ON
ON
8 Mhz
OFF
ON
ON
16 Mhz
ON
OFF
ON
20 Mhz
OFF
OFF
ON
25 Mhz
ON
ON
OFF
33 Mhz (De fault)
OFF
ON
OFF
40 Mhz
ON
OFF
OFF
50 Mhz
OFF
OFF
OFF
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