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8XC196NP, 80C196NU USER’S MANUAL
2-10
Figure 2-6. Effect of Clock Mode on CLKOUT Frequency
Table 2-3. Relationships Between Input Frequency, Clock Multiplier, and State Times
F
XTAL1
(Frequency
on XTAL1)
PLLEN2:1 Multiplier
f
(Input Frequency to
the Divide-by-two Circuit)
t
(Clock
Period)
State Time
50 MHz
†
00 1 50 MHz 20 ns 40 ns
25 MHz
00 1 25 MHz 40 ns 80 ns
10 2 50 MHz 20 ns 40 ns
12.5 MHz
00 1 12.5 MHz 80 ns 160 ns
10 2 25 MHz 40 ns 80 ns
11 4 50 MHz 20 ns 40 ns
†
Assumes an external clock. The maximum frequency for an external crystal oscillator is 25 MHz.
CLKOUT
CLKOUT
t = 80ns
t = 40ns
t = 20ns
CLKOUT
T
XHCH
XTAL1
(12.5 MHz)
f
PLLEN2:1=10
f
PLLEN2:1=11
f
PLLEN2:1=00
A3160-01