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R01UH0336EJ0102 Rev.1.02
Page 259 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 7 Clock Generation
7.3 Selecting the Input Clock Signal
The clock generator consists of an oscillator and PLL synthesizers and is
capable of, generating internal system clocks at 48, 64, and 80 MHz when an
external resonator (crystal oscillator or ceramic oscillator) running at 8 or 16
MHz is connected to the X1 and X2 pins.
For the oscillator to be connected to the X1 and X2 pins, refer to Table 7-1,
Oscillators Connectable to the X1 and X2 Pins. The 8- or 16-MHz signal from
the external resonator is input to PLL1, which produces a frequency-multiplied
clock signal for supply that is supplied to the CPU as the operating clock and to
peripheral I/O via the prescaler.
Table 7-1
Oscillators Connectable to the X1 and X2 Pins
Table 7-2
Operating Frequency
Note
For input frequency and multiplier settings, refer to Section 6.5, Option-Setting
Bytes.
Oscillators Connectable to the X1 and X2 Pins
8 MHz (
PD70F4155)
16 MHz (
PD70F4154)
Internal System
Clock
Peripheral Input-
Output Clock
(PCLK)
Frequency of External
Resonator
48 MHz
24/48 MHz
8 MHz (
PD70F4155)
16 MHz (
PD70F4154)
64 MHz
32/64 MHz
80 MHz
40/80 MHz