參數(shù)資料
型號: UPD70433R-12
廠商: NEC Corp.
元件分類: 16位微控制器
英文描述: V55PITM 16-BIT MICROPROCESSOR
中文描述: V55PITM 16位微處理器
文件頁數(shù): 68/166頁
文件大?。?/td> 772K
代理商: UPD70433R-12
68
μ
PD70433
14. CLOCK GENERATOR
The clock generator supplies various clocks to the CPU and peripheral hardware, and controls the CPU operating mode.
14.1 CLOCK GENERATOR CONFIGURATION AND OPERATION
The clock generator is configured as shown in Figure 14-1.
The clock generator clock is generated by a crystal resonator or ceramic resonator connected to the X1 and X2 pins.
The clock generator output is subjected to waveform shaping (dividing frequency by 2) and selection of the scaling factor
by means of the processor control register (PRC), and is then used as the system clock
φ
.
The system clock
φ
scaling factor is specified by the PCK1 and PCK0 bits of the PRC register, and can be selected as
1/2, 1/4, 1/8 or 1/16 the oscillator frequency (f
XX
).
Selecting a low-speed system clock
φ
reduces the current consumption of internal circuit, allowing extended operation
of a battery-driven system even when the voltage drops.
An external clock can be input. In this case, the clock signal should be input to the X1 pin, and leave the X2 pin open.
Figure 14-1. Clock Generator
Clock
Oscillator
X1
X2
1/2
1/2
1/2
1/2
f
XX
Waveform
Shaping
1
8
f
XX
1
4
f
XX
1
2
f
XX
(=f
X
)
φ
Time Base
Counter
Baud Rate Generator
Watchdog Timer
System Clock
CLKOUT
S
I
8
PRC
PCK0
PCK1
TB0
TB1
0
ENCLK
1
1
Frequency
Dividers
1
16
f
XX
Software Interval Timer
Refresh Cycle Generator
PWM
f
XX
φ
PRC: Processor control register
: Oscillator frequency
: System clock
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