162
CHAPTER 7 CLOCK GENERATOR
MCC
FRC
CLS
CSS
PCC2 PCC1 PCC0
PCC
CLS
0
1
Main system clock
Subsystem clock
FFFBH
04H
R/W
Note 1
<7>
<5>
<4>
Symbol
Address
After
Reset
R/W
0
<6>
3
2
0
1
CSS
0
0
f
XX
/2
PCC2
CPU CIock (f
CPU
) Selection
PCC1 PCC0
CPU Clock Status
0
0
0
1
0
0
1
1
0
1
1
0
0
0
0
0
0
0
0
1
1
0
0
1
1
0
1
0
f
XX
/2
2
f
XX
/2
3
f
XX
/2
4
f
XT
/2
f
XX
Setting prohibited
Other than above
FRC
0
1
Internal feedback resistor used
Internal feedback resistor not used
Subsystem Clock Feedback Resistor Selection
MCC
0
1
Oscillation possible
Oscillation stopped
Main System Clock Oscillation Control
Note 2
R/W
R/W
R/W
R
f
x
/2
f
x
/2
2
f
x
/2
3
f
x
/2
4
f
x
f
x
/2
2
f
x
/2
3
f
x
/2
4
f
x
/2
5
f
x
/2
MCS = 1
MCS = 0
0
1
Figure 7-3. Processor Clock Control Register Format
Notes 1. Bit 5 is Read Only.
2. When the CPU is operating on the subsystem clock, MCC should be used to stop the main
system clock oscillation. A STOP instruction should not be used.
Caution Bit 3 must be set to 0.
Remarks 1. f
XX
: Main system clock frequency (f
X
or f
X
/2)
2. f
X
: Main system clock oscillator frequency
3. f
XT
: Subsystem clock oscillator frequency
4. MCS : Bit 0 of oscillation mode selection register (OSMS)
Содержание PD78052
Страница 2: ...2 MEMO ...
Страница 8: ...8 MEMO ...
Страница 16: ...16 MEMO ...
Страница 36: ...36 MEMO ...
Страница 158: ...158 MEMO ...
Страница 174: ...174 MEMO ...
Страница 240: ...240 MEMO ...
Страница 260: ...260 MEMO ...
Страница 340: ...340 MEMO ...
Страница 392: ...392 MEMO ...
Страница 438: ...438 MEMO ...
Страница 482: ...482 CHAPTER 20 REAL TIME OUTPUT PORT MEMO ...
Страница 510: ...510 MEMO ...
Страница 524: ...524 MEMO ...
Страница 560: ...560 MEMO ...
Страница 576: ...576 MEMO ...
Страница 598: ...598 MEMO ...
Страница 602: ...602 MEMO ...