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VR4102 Datasheet(PDF) 245 Page - NEC

Part # VR4102
Description  64/32-bit Microprocessor
PDF  701 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

VR4102 Datasheet(HTML) 245 Page - NEC

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CHAPTER 10 BCU (BUS CONTROL UNIT)
245
10.2.8 CLKSPEEDREG (0x0B00 0014)
Bit
D15
D14
D13
D12
D11
D10
D9
D8
Name
DIV2B
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
R/W
R
RR
RRR
R
R
RTCRST
0
0
0
0
0
0
0
0
Other resets
0
0
0
0
0
0
0
0
Bit
D7D6D5
D4D3
D2D1
D0
Name
Reserved
Reserved
Reserved
CLKSP[4]
CLKSP[3]
CLKSP[2]
CLKSP[1]
CLKSP[0]
R/W
RRR
RR
RR
R
RTCRST
0
0
0
Undefined
Undefined
Undefined
Undefined
Undefined
Other resets
0
0
0
Undefined
Undefined
Undefined
Undefined
Undefined
Bit
Name
Function
D[15]
DIV2B
The multiplier of TClock frequency. This bit always indicates 0 in the current VR4102.
1: Reserved
0: Multiplied by 16
D[14..5]
Reserved
Write 0 when writing. 0 is returned after a read.
D[4..0]
CLKSP[4..0]
These bits indicate the value used to calculate the frequency of PClock and TClock.
This register is used to indicate the value to calculate the frequencies of the peripheral unit’s operating clock
(TClock) and CPU core’s operating clock (PClock). The PClock frequency obtained from this register’s setting is the
same as the frequency selected by setting CLKSEL[2:0] pins.
The following method is used to calculate TClock frequency.
TClock = (18.432 MHz/CLKSP[4..0])*16
The following method is used to calculate PClock frequency.
PClock = (18.432 MHz/CLKSP[4..0])*32



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