參數(shù)資料
型號: MC68334GVFC20
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
封裝: PLASTIC, QFP-132
文件頁數(shù): 25/76頁
文件大?。?/td> 444K
代理商: MC68334GVFC20
MC68334
MOTOROLA
MC68334TS/D REV. 1
31
Port size determines the way in which bus transfers to an external address are allocated. Port size of
eight bits or sixteen bits can be selected when a pin is assigned as a chip select. Port size and transfer
size affect how the chip-select signal is asserted. Refer to 3.5.4 Option Registers for more information.
Out of reset, chip-select pin function is determined by the logic level on a corresponding data bus pin.
These pins have weak internal pull-up drivers, but can be held low by external devices. Either 16-bit
chip-select function (%11) or alternate function (%01) can be selected during reset. All pins except the
boot ROM select pin (CSBOOT) are disabled out of reset. There are twelve chip-select functions and
only eight associated data bus pins. There is not a one-to-one correspondence. The table below shows
reset states.
The CSBOOT signal is normally enabled out of reset. The state of the DATA0 line during reset deter-
mines what port width CSBOOT uses. If DATA0 is held high (either by the weak internal pull-up driver
or by an external pull-up device), 16-bit width is selected. If DATA0 is held low, 8-bit port size is selected.
A pin programmed as a discrete output drives an external signal to the value specified in the pin data
register. No discrete output function is available on pins CSBOOT, BR, BG, or BGACK. ADDR23 pro-
vides ECLK output rather than a discrete output signal.
When a pin is programmed for discrete output or alternate function, internal chip-select logic still func-
tions and can be used to generate DSACK or AVEC internally on an address and control signal match.
3.5.3 Base Address Registers
Each chip select has an associated base address register. A base address is the lowest address in the
block of addresses enabled by a chip select. Block size is the extent of the address block above the
base address. Block size is determined by the value contained in a BLKSZ field. Block addresses for
different chip selects can overlap.
The BLKSZ field determines which bits in the base address field are compared to corresponding bits on
the address bus during an access. Provided other constraints determined by option register fields are
also satisfied, when a match occurs, the associated chip-select signal is asserted.
The chip-select address compare logic uses only the most significant bits to match an address within a
block. The value of the base address must be a multiple of block size. Base address register diagrams
show how base register bits correspond to address lines.
After reset, the MCU fetches the initialization routine from the address contained in the reset vector, lo-
cated beginning at address $000000 of program space. To support bootstrap operation from reset, the
base address field in chip-select base address register boot (CSBARBT) has a reset value of all zeros.
A memory device containing the reset vector and initialization routine can be automatically enabled by
CSBOOT after a reset. The block size field in CSBARBT has a reset value of 512 Kbytes.
Table 18 Reset Pin Function of CS[10:6]
Data Bus Pins at Reset
Chip-Select/Address Bus Pin Function
DATA7
DATA6
DATA5
DATA4
DATA3
CS10/
ADDR23
CS9/
ADDR22
CS8/
ADDR21
CS7/
ADDR20
CS6/
ADDR19
11111
CS10
CS9
CS8
CS7
CS6
1111
0
CS10
CS9
CS8
CS7
ADDR19
111
0
X
CS10
CS9
CS8
ADDR20
ADDR19
11
0
X
CS10
CS9
ADDR21
ADDR20
ADDR19
1
0
X
CS10
ADDR22
ADDR21
ADDR20
ADDR19
0
XXXX
ADDR23
ADDR22
ADDR21
ADDR20
ADDR19
相關PDF資料
PDF描述
MC68334GCFC20 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
MC68334MFC20 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
MC68334VFC20 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
MC68334AVFC20 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
MC68334VFC16 32-BIT, 16 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