CHAPTER 6 CLOCK GENERATOR
Preliminary User’s Manual U17260EJ3V1UD
140
Table 6-2. Relationship Between CPU Clock and Minimum Instruction Execution Time
Minimum Instruction Execution Time: 2/f
CPU
Main System Clock
High-Speed System Clock
Note
Internal
High-Speed
Oscillation Clock
Note
Subsystem Clock
CPU Clock (f
CPU
)
At 10 MHz
Operation
At 20 MHz
Operation
At 8 MHz (TYP.) Operation
At 32.768 kHz Operation
f
XP
0.2
µ
s 0.1
µ
s 0.25
µ
s (TYP.)
−
f
XP
/2 0.4
µ
s 0.2
µ
s 0.5
µ
s (TYP.)
−
f
XP
/2
2
0.8
µ
s 0.4
µ
s 1.0
µ
s (TYP.)
−
f
XP
/2
3
1.6
µ
s 0.8
µ
s 2.0
µ
s (TYP.)
−
f
XP
/2
4
3.2
µ
s 1.6
µ
s 4.0
µ
s (TYP.)
−
f
SUB
/2
−
−
122.1
µ
s
Note
The main clock mode register (MCM) is used to set the main system clock supplied to CPU clock (high-
speed system clock/internal high-speed oscillation clock) (see
Figure 6-6
).
(3) Setting of operation mode for subsystem clock pin
The operation mode for the subsystem clock pin can be set by using bit 6 (XTSTART) of the processor clock
control register (PCC) and bits 5 and 4 (EXCLKS, OSCSELS) of the clock operation mode select register
(OSCCTL) in combination.
Table 6-3. Setting of Operation Mode for Subsystem Clock Pin
PCC OSCCTL
Содержание 78K/0 Series
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