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AR-B1474 User¡¦s Guide
3-8
(4) CPU Clock Select (JP6 & JP9)
For different type of CPUs, the clock generator and clock divisor need to be set by JP6 and JP9. The clock base is
selected by JP6, JP9 is used to select single or half clock system. We recommend that you refer the following
table for setting the CPU clock.
2X
1 2 3
1X
1 2 3
1 2 3
JP9
1 2 3
Factory Preset
Figure 3-14 JP9: CPU System Clock Multiplier Select
Pin Definition
1-2 A
3-4 B
5-6 C
1
2
3
4
5
6
BA C
Table 3-5 JP6: CPU Base Clock
JP6
CPU Type
CPU
Clock
Base
Clock
JP9
A B C
Note
DX-25, DX2-50,
DX4-75
25MHz 50MHz 1X Close Open Open
DX-33, DX2-66,
DX4-100, 5X86-
133
33.3MHz 33.3MHz 1X Close Open Close
Factory
Preset
DX-40, DX2-80,
DX4-120
40MHz 40MHz 1X Close Close Open
DX-50 50MHZ 50MHz 1X Close Close Close
Table 3-6 CPU Clock Setting