參數(shù)資料
型號: MC68334GMFC16
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 16 MHz, MICROCONTROLLER, PQFP132
封裝: PLASTIC, QFP-132
文件頁數(shù): 14/76頁
文件大?。?/td> 444K
代理商: MC68334GMFC16
MC68334
MOTOROLA
MC68334TS/D REV. 1
21
Figure 8 System Clock Filter Networks
The synthesizer locks when VCO frequency is equal to EXTAL frequency. Lock time is affected by the
filter time constant and by the amount of difference between the two comparator inputs. Whenever com-
parator input changes, the synthesizer must relock. Lock status is shown by the SLOCK bit in SYNCR.
During power-up, the MCU does not come out of reset state until the synthesizer locks. Crystal type,
characteristic frequency, and layout of external oscillator circuitry affect lock time.
When the clock synthesizer is used, control register SYNCR determines operating frequency and vari-
ous modes of operation. The SYNCR W bit controls a three-bit prescaler in the feedback divider. Setting
W increases VCO speed by a factor of four. The SYNCR Y field determines the count modulus for a
modulo 64 down counter, causing it to divide by a value of Y
+ 1. When W or Y values change, VCO
frequency changes, and there is a VCO relock delay. The SYNCR X bit controls a divide-by-two circuit
that is not in the synthesizer feedback loop. When X = 0 (reset state), the divider is enabled, and system
clock frequency is one-fourth VCO frequency; setting X disables the divider, doubling clock speed with-
out changing VCO speed. There is no relock delay when clock speed is changed by the X bit.
Clock frequency is determined by SYNCR bit settings as follows:
The reset state of SYNCR ($3F00) produces a modulus-64 count.
For the device to perform correctly, system clock and VCO frequencies selected by the W, X, and Y bits
must be within the limits specified for the MCU. Do not use a combination of bit values that selects either
an operating frequency or a VCO frequency greater than the maximum specified values.
3.3.3 External Bus Clock
The state of the external clock division bit (EDIV) in SYNCR determines clock rate for the external bus
clock signal (ECLK) available on pin ADDR23. ECLK is a bus clock for MC6800 devices and peripher-
als. ECLK frequency can be set to system clock frequency divided by eight or system clock frequency
divided by sixteen. The clock is enabled by the CS10 field in chip select pin assignment register 1
(CSPAR1). ECLK operation during low-power stop is described in the following paragraph. Refer to 3.5
Chip Selects for more information about the external bus clock.
16/32 XFC CONN
1. MAINTAIN LOW LEAKAGE ON THE XFC NODE.
2. RECOMMENDED LOOP FILTER FOR REDUCED SENSITIVITY TO LOW-FREQUENCY NOISE.
0.01
F
0.1
F
NORMAL OPERATING
ENVIRONMENT
HIGH-STABILITY OPERATING
ENVIRONMENT
C4
C1
VSSI
VDDSYN
XFC1
0.1
F
C3
0.01
F
0.1
F
C4
C1
VSSI
VDDSYN
XFC1, 2
0.1
F
C3
0.01
F
C2
18k
R1
F
SYSTEM
F
REFERENCE 4Y
1
+
() 2
2W
X
+
()
[]
=
相關PDF資料
PDF描述
MC68334GVFC16 32-BIT, 16 MHz, MICROCONTROLLER, PQFP132
MC68334GVFC20 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
MC68334GCFC20 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
MC68334MFC20 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
MC68334VFC20 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
相關代理商/技術參數(shù)
參數(shù)描述
MC68336ACAB20 功能描述:IC MCU 32BIT 20MHZ 160-QFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:M683xx 標準包裝:1 系列:87C 核心處理器:MCS 51 芯體尺寸:8-位 速度:16MHz 連通性:SIO 外圍設備:- 輸入/輸出數(shù):32 程序存儲器容量:8KB(8K x 8) 程序存儲器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4 V ~ 6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:外部 工作溫度:0°C ~ 70°C 封裝/外殼:44-DIP 包裝:管件 其它名稱:864285
MC68336ACAB25 功能描述:IC MCU 32BIT 25MHZ 160-QFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:M683xx 標準包裝:1 系列:87C 核心處理器:MCS 51 芯體尺寸:8-位 速度:16MHz 連通性:SIO 外圍設備:- 輸入/輸出數(shù):32 程序存儲器容量:8KB(8K x 8) 程序存儲器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4 V ~ 6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:外部 工作溫度:0°C ~ 70°C 封裝/外殼:44-DIP 包裝:管件 其它名稱:864285
MC68336ACFT20 功能描述:IC MCU 32BIT 20MHZ AMASK 160-QFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:M683xx 其它有關文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標準包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C,IrDA,LIN,SPI,UART/USART 外圍設備:DMA,PDR,POR,PVD,PWM,溫度傳感器,WDT 輸入/輸出數(shù):26 程序存儲器容量:64KB(64K x 8) 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN,36-VFQFPN 包裝:托盤 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱:497-9032STM32F101T8U6-ND
MC68336AMAB20 功能描述:IC MCU 32BIT 20MHZ 160-QFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:M683xx 標準包裝:1 系列:87C 核心處理器:MCS 51 芯體尺寸:8-位 速度:16MHz 連通性:SIO 外圍設備:- 輸入/輸出數(shù):32 程序存儲器容量:8KB(8K x 8) 程序存儲器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4 V ~ 6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:外部 工作溫度:0°C ~ 70°C 封裝/外殼:44-DIP 包裝:管件 其它名稱:864285
MC68336GCAB20 功能描述:IC MCU 32BIT 20MHZ GMASK 160-QFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:M683xx 標準包裝:1 系列:87C 核心處理器:MCS 51 芯體尺寸:8-位 速度:16MHz 連通性:SIO 外圍設備:- 輸入/輸出數(shù):32 程序存儲器容量:8KB(8K x 8) 程序存儲器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4 V ~ 6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:外部 工作溫度:0°C ~ 70°C 封裝/外殼:44-DIP 包裝:管件 其它名稱:864285