MB90480/485 Series
16. Clock
The clock generator module controls the operation of the internal clock circuits that serve as the operating clock
for the CPU and peripheral devices. This internal clock is referred to as the machine clock, and one cycle is referred
to as a machine cycle. Also, the clock signals from the base oscillator are called the oscillator clock, and those from
the PLL oscillator are called the PLL clock.
(1) Register List
Clock select register (CKSCR)
15
14
13
12
11
10
9
8
0000A1H
SCM
MCM
WS1
WS0
SCS
MCS
CS1
CS0
Read/write
Initial value
R
1
R
1
R/W
1
R/W
1
R/W
1
R/W
1
R/W
0
R/W
0
PLL output select register (PLLOS)
15
14
13
12
11
10
9
8
0000CFH
⎯
⎯
⎯
⎯
⎯
⎯
⎯
PLL2
Read/write
Initial value
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
W
X
W
0
68
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