UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 180

• Manufacturer Part Number: UPD78F0838
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

178
Note The main clock mode register (MCM) is used to set the CPU clock (high-speed system clock/internal
f
f
f
f
f
f
MAIN
MAIN
MAIN
MAIN
MAIN
SUB
CPU Clock (f
/2
/2
/2
/2
/2
2
3
4
high-speed oscillation clock) (see Figure 5-4).
Table 5-2. Relationship between CPU Clock and Minimum Instruction Execution Time
CPU
)
0.2 s
0.4 s
0.8 s
1.6 s
3.2 s
High-Speed System Clock
At 10 MHz
Operation
0.1 s
0.2 s
0.4 s
0.8 s
1.6 s
Preliminary User’s Manual U19748EJ1V0UD
CHAPTER 5 CLOCK GENERATOR
At 20 MHz
Operation
Minimum Instruction Execution Time: 2/f
Note
0.25 s (TYP.)
0.5 s (TYP.)
1.0 s (TYP.)
2.0 s (TYP.)
4.0 s (TYP.)
Internal high-speed oscillation
At 8 MHz (TYP.) Operation
clock
Note
122.1 s
CPU
At 32.768 kHz Operation
Subsystem Clock