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參數(shù)資料
| 型號： | M37640M8-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | 14 X 20 MM, 0.80 MM PITCH, PLASTIC, QFP-80 |
| 文件頁數(shù)： | 72/96頁 |
| 文件大小： | 1477K |
| 代理商： | M37640M8-XXXFP |
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74
Ver 1.4
MITSUBISHI MICROCOMPUTERS
7640 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
1.24.1 Frequency Synthesizer Circuit
The Frequency Synthesizer Circuit generates a 48MHz
clock needed by the USB block and a clock fSYN that
are both a multiple of the external input reference
clock fIN. A block diagram of the circuit is shown in
Figure 1.91.
The frequency synthesizer consists of a prescaler, fre-
quency multiplier macro, a frequency divider macro,
and four registers, namely FSM1, FSM2, FSC and
FSD. Two multiply registers (FSM1, FSM2) control the
frequency multiply amount. Clock fIN is prescaled us-
ing FSM2 to generate fPIN. fPIN is multiplied using
FSM1 to generate an fVCO clock which is then divided
using FSD to produce the clock fSYN. The fVCO clock
is optimized for 48 MHz operation and is buffered and
sent out of the frequency synthesizer block as signal
fUSB. This signal is used by the USB block. The clock
block diagram is shown in Figure 1.92.
Clock fPIN is a divided down version of clock fIN, which
can be either f(Xin) or f(XCin). The default clock after re-
set is fXin. The relationship between fPIN and the clock
input to the prescaler (fIN) is as follows:
fPIN = fIN/2(n+1) where n is a decimal number between
0 and 254. (See Figure 1.95).
Setting FSM2 to 255 disables the prescaler and fPIN =
fIN.
Data Bus
FSM2
FSM1
FSC
FSD
006E
006D
006C
006F
Frequency
Multiplier
Frequency
Divider
8
B
it
LS
Bit
fIN
fVCO
fSYN
fUSB
Prescaler
8
B
it
fPIN
The relationship between fPIN, fVCO, fSYN, and fUSB is
as follows:
fVCO = fPIN x 2(n+1) where n is the decimal equivalent
of the value loaded in FSM1. (See Figure 1.94).
n must be chosen such that fVCO equals 48 MHz.
fSYN = fVCO / 2(m+1) where m is the decimal equiva-
lent of the value loaded in FSD. (See Figure 1.96).
Setting m=255 disables the divider and disables fSYN.
fUSB is a buffered version of fVCO, i.e., FSD has no ef-
fect on fUSB.
Setting USB control register bit 5 to “0” disables fUSB
by tri-stating the buffer.
The FSC0 bit in the FSC Register (FSC) enables the
frequency synthesizer block. When disabled (FSC0 =
“0”), fVCO is held at either a high or low state. When
the frequency synthesizer control bit is active (FSC0
= “1”), a lock status (LS = “1”) indicates that fSYN and
fVCO are the correct frequency. The LS and FSCO
control bits in the FSC register are shown in Figure
1.93.
When using the frequency synthesizer, a low-pass fil-
ter must be connected to the LPF pin.
Once the frequency synthesizer is enabled, a delay of
2-5ms is recommended before the output of the fre-
quency synthesizer is used. This is done to allow the
output to stabilize. It is also recommended that none
of the registers be modified once the frequency syn-
thesizer is enabled as it will cause the output to be
temporarily (2-5ms) unstable.
Fig. 1.91. Frequency Synthesizer Circuit
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| M37641F8E8-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37641F8FP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37641F8FP#U0 | 功能描述:IC 740 MCU FLASH 32K 80QFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:740/7600 標準包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設備:POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):21 程序存儲器容量:40KB（20K x 16） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數(shù)據(jù)轉換器:A/D 6x12b 振蕩器型:內部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
| M37641F8HP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37641F8HP#U0 | 功能描述:IC 740 MCU FLASH 32K 80LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:740/7600 產(chǎn)品培訓模塊:Graphics LCD System and PIC24 Interface Asynchronous Stimulus 標準包裝:27 系列:PIC® 24H 核心處理器:PIC 芯體尺寸:16-位 速度:40 MIP 連通性:I²C，SPI，UART/USART 外圍設備:欠壓檢測/復位，POR，PWM，WDT 輸入/輸出數(shù):21 程序存儲器容量:12KB（4K x 24） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:1K x 8 電壓 - 電源 (Vcc/Vdd):3 V ~ 3.6 V 數(shù)據(jù)轉換器:A/D 10x10b/12b 振蕩器型:內部 工作溫度:-40°C ~ 85°C 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 包裝:管件 產(chǎn)品目錄頁面:648 (CN2011-ZH PDF) 配用:AC164339-ND - MODULE SKT FOR PM3 28SOICDV164033-ND - KIT START EXPLORER 16 MPLAB ICD2 |
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