HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 126
HD6417615
Manufacturer Part Number
HD6417615
Description
Hardware Manual
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6417615.pdf
(873 pages)
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Table 3.2
Clock Mode
5
6
The internal clock frequency can be changed in each clock mode (see section 3.2.5, Operating
Frequency Selection by Register).
In clock modes 4 to 6, the frequency of the clock input from the CKIO pin can be changed, or the
clock can be stopped (see section 20.4.4, Clock Pause Function).
Table 3.3 lists the relationship between pins MD2 to MD0 and the clock operating mode. Do not
switch the MD2–MD0 pins while they are operating. Switching will cause operating errors.
108
Operating Modes (cont)
Function/Operation
Only PLL circuit 1 operates. Operate PLL circuit 1 when
operating with a 1/4
CKIO pin and the internal clocks (Iø, Eø, Pø) with respect to
system clock ø. PLL circuit 2 does not operate in this mode
PLL circuit 1 can be switched between the operating and
halted states by means of control bits in the frequency
modification register (FMR). However, clock phase shifting is
not performed when PLL circuit 1 is halted.
Normally, mode 4 should be used.
PLL circuits 1 and 2 do not operate. Set this mode when a
clock having a frequency equal to that of clocks the clock
input from the CKIO pin is used
cycle lag of the clock input from the
Clock Source
External clock input
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