參數(shù)資料
型號(hào): MC68307CFG16
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 16-BIT, 16.67 MHz, MICROCONTROLLER, PQFP100
封裝: PLASTIC, QFP-100
文件頁數(shù): 189/264頁
文件大?。?/td> 949K
代理商: MC68307CFG16
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁當(dāng)前第189頁第190頁第191頁第192頁第193頁第194頁第195頁第196頁第197頁第198頁第199頁第200頁第201頁第202頁第203頁第204頁第205頁第206頁第207頁第208頁第209頁第210頁第211頁第212頁第213頁第214頁第215頁第216頁第217頁第218頁第219頁第220頁第221頁第222頁第223頁第224頁第225頁第226頁第227頁第228頁第229頁第230頁第231頁第232頁第233頁第234頁第235頁第236頁第237頁第238頁第239頁第240頁第241頁第242頁第243頁第244頁第245頁第246頁第247頁第248頁第249頁第250頁第251頁第252頁第253頁第254頁第255頁第256頁第257頁第258頁第259頁第260頁第261頁第262頁第263頁第264頁
Signal Description
MOTOROLA
MC68307 USER’S MANUAL
2-7
chip selects by programming, but it has the three extra enable outputs which are used to
further divide this address space. If they are used, each of the four peripheral enable outputs
decode fixed 16-Kbyte address ranges within the confines of the programmed range of CS2
(which should therefore be a block 64K bytes in size). Refer to Section 5.1.2.2 Peripheral
Chip Selects and Section 5.2.2 Chip Select Registers for details. The data bus width for
memory devices selected by this chip select is programmable, between 8- and 16-bit data,
in the system control register.
The CS2/CS2A chip select signal has its own pin on the MC68307, but the three extra
enable outputs CS2B, CS2C, CS2D are multiplexed with the port A input/output functions,
and require to be programmed to use these pins at cold reset. This is done by setting bits in
the port A control register (PACNT) as well as a bit in the system control register to enable
the peripheral address decoder. As port A defaults to an input port on cold reset, these three
additional peripheral chip select lines, if they are used, should have pullup resistors to
ensure peripherals are not accidentally enabled during system initialization.
When programmed as general-purpose input/output port lines, CS2B–CS2D function as
PA0–PA2.
2.2.4 Chip Select 3 (CS3)
This chip select output can be programmed to perform an 8051-compatible bus cycle rather
than a M68000 bus cycle. If 8051-compatible bus access is not required in a design, then
this signal can be programmed to be a general purpose chip-select output. The data bus
width for M68000-bus memory devices selected by this chip select is programmable,
between 8- and 16-bit data, in the system control register. If the 8051-compatible bus inter-
face is enabled, then the data-bus width for this chip select should be programmed to be 8
bits. The 8051-compatible bus has an address space (typically 64 Kbytes long, but not
restricted) which can be located anywhere in memory, as long as it does not overlap with
other programmed chip select ranges.
2.3 BUS CONTROL SIGNALS
These are signals that may be decoded or provided by external logic, to control the various
types of bus access which can occur.
The bus control signals are three-stated whenever the MC68307 is arbitrated off the bus by
an external bus master.
2.3.1 Data Transfer Acknowledge (DTACK)
This bidirectional, open-drain, active-low signal indicates that the data transfer has been
completed. DTACK is an output when it is generated internally by the programmable wait-
state generators in the chip-select logic (including CS3 for 8051-compatible bus accesses),
or during an access to internal peripheral registers. It is an input for all other M68000 bus
cycles, i.e., when the MC68307 accesses an external device not within the range of the chip-
select logic or when programmed to be generated externally for any particular chip-select.
In this case, external logic must assert it in order to complete the bus cycle.
相關(guān)PDF資料
PDF描述
MC68307PU16 16-BIT, 16.67 MHz, MICROCONTROLLER, PQFP100
MC68307PU16V 16-BIT, 16.67 MHz, MICROCONTROLLER, PQFP100
MC68307FG16 16-BIT, 16.67 MHz, MICROCONTROLLER, PQFP100
MC68322FT16 16-BIT, 16.667 MHz, RISC PROCESSOR, PQFP160
MC68331CFC20B1 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68307UM 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Technical Summary Integrated Multiple-Bus Processor
MC68307V 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Technical Summary Integrated Multiple-Bus Processor
MC68322 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Integrated Printer Processor
MC68322AD 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Integrated Printer Processor
MC68322FT20 制造商:Rochester Electronics LLC 功能描述:- Bulk