Clock Control Unit; Block Diagram Of Clock Control Unit - NEC uPD98502 User Manual

1.12 Clock Control Unit

This section describe µ PD98502's internal clock is supplied by Clock Control Unit (CCU) with following figure.
P L L
(x 6 )
S C LK (33 M H z)
56
CHAPTER 1 INTRODUCTION
Figure 1-13. Block Diagram of Clock Control Unit
C C U (C L O C K C O N T R O L U N IT )
1/2
1/4
1/8
C L O C K
E N AB L E R
C L O C K
E N AB L E R
1/3
C L O C K
E N AB L E R
C L O C K
E N AB L E R
C L O C K
E N AB L E R
1 /2
1 /3
Preliminary User's Manual S15543EJ1V0UM
33/25/16.5 M H z
66 M H z
U S B C LK (12 M H z)
48 M H z
66 M H z
M ITC LK (25 M H z)
25 M H z
M IR C LK (25 M H z)
25 M H z
66 M H z
M ITC LK (25 M H z)
25 M H z
M IR C LK (25 M H z)
25 M H z
66 M H z
P C IC LK (33 M H z)
66 M H z
66 M H z
pcistop
m ac2stop
m acstop
usbstop
atm stop
66 M H z
100/66 M H z
U R TC LK
(18.432 M H z)
25/16.7
P e rip h e ra l
M H z
100/66M H z
AT M C e ll
P ro c e s s o r
U S B
C o n tro lle r
E th e rn e t
C o n tro lle r
# 1
E th e rn e t
C o n tro lle r
# 2
P C I
C o n tro lle r
IB U S
S E L U AR T
S ys te m
C o n tro lle r
V 4 1 2 0 A
R