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169
CHAPTER 7 CLOCK GENERATOR
The fastest instruction of the
µ
PD78078 and 78078Y Subseries can be executed in two clocks of the CPU clock.
The relationship between the CPU clock (fCPU) and the minimum instruction execution time is shown in Table 7-2.
Table 7-2. Relationship between CPU Clock and Minimum Instruction Execution Time
CPU Clock (fCPU) Minimum Instruction Execution Time: 2/fCPU
fX 0.4
µ
s
fX/2 0.8
µ
s
fX/2
2
1.6
µ
s
fX/2
3
3.2
µ
s
fX/2
4
6.4
µ
s
fX/2
5
12.8
µ
s
fXT/2 122
µ
s
fX = 5.0 MHz, fXT = 32.768 kHz
f
X : Main system clock oscillation frequency
fXT: Subsystem clock oscillation frequency