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| 型號(hào)： | M30240M2 |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單片16位CMOS微機(jī) |
| 文件頁(yè)數(shù)： | 41/142頁(yè) |
| 文件大?。?/td> | 1637K |
| 代理商： | M30240M2 |
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1-41
Mitsubishi microcomputers
M30240 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Preliminary Specifications REV. E
Specifications in this manual are tentative and subject to change
Frequency Synthesizer Circuit
2.17 Frequency Synthesizer Circuit
The Frequency Synthesizer Circuit generates a 48MHz clock needed by the USB block and a clock f
SYN
that are both a multiple of the external input reference clock f(Xin). A block diagram of the circuit is shown
in Figure 1.23.
Figure 1.23: Frequency Synthesizer Circuit
The frequency synthesizer consists of a prescaler, frequency multiplier macro, a frequency divider
macro, and five registers, namely FSP, FSM, FSC, FSD, and FSCCR. Clock f(Xin) is prescaled down
using FSP to generate f
PIN
. f
PIN
is multiplied using FSM to generate an f
VCO
clock which is then divided
using FSD to produce the clock f
SYN
. The f
VCO
clock is optimized for 48 MHz operation and is buffered
and sent out of the frequency synthesizer block as signal f
USB
. This signal is used by the USB block.
2.17.1 Prescaler
Clock f
PIN
is a divided down version of clock f(Xin) (see Figure 1.24). The relationship between f
PIN
and the clock input to the prescaler f(Xin) is as follows:
f
PIN
= f(Xin) / 2(n+1) where n is a decimal number between 0 and 254.
Setting FSP to 255 disables the prescaler and f
PIN
= f(Xin).
Note: f(Xin) frequency below 1 MHz is not recommended.
Figure 1.24: Frequency Synthesizer Prescaler Register (FSP)
FSP
Data Bus
FSM
FSC
FSD
03DE
03DD
03DC
03DF
Frequency
Multiplier
Frequency
Divider
8
LS
8 Bit
f(Xin)
f
VCO
f
SYN
f
USB
Prescaler
8
f
PIN
FSCCR
03DB
FSCCR0
EN
USBC5
2
f
PIN
FSP
f(Xin)
Dec(n)
255
5
2
1
0
Hex(n)
FF
05
02
01
00
12 MHz
1 MHz
2 MHz
3 MHz
6 MHz
12.00 MHz
12.00 MHz
12.00 MHz
12.00 MHz
12.00 MHz
MSB
7
LSB
0
Bit 6
Bit 1
Bit 0
Bit 2
Bit 5
Bit 4
Bit 3
Bit 7
Access: R/W
Address: 03DE
16
Reset: FF
16
f(Xin)
/2(
n
+1) = f
PIN
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M30240M3 | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240M4 | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240E2-XXXFP | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240E5-XXXFP | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240E6-XXXFP | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M30240M2-XXXFP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240M3 | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240M3-XXXFP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240M4 | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240M4-XXXFP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
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