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| 型號： | MC68331CFC20B1 |
| 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： | 0.950 X 0.950 INCH, 0.025 INCH PITCH, PLASTIC, QFP-132 |
| 文件頁數(shù)： | 19/90頁 |
| 文件大?。?/td> | 481K |
| 代理商： | MC68331CFC20B1 |
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MOTOROLA
MC68331
26
MC68331TS/D
3.4.4 Address Strobe
AS is a timing signal that indicates the validity of an address on the address bus and the validity of many
control signals. It is asserted one-half clock after the beginning of a bus cycle.
3.4.5 Data Bus
Data bus signals DATA[15:0] make up a bidirectional, non-multiplexed parallel bus that transfers data
to or from the MCU. A read or write operation can transfer 8 or 16 bits of data in one bus cycle. During
a read cycle, the data is latched by the MCU on the last falling edge of the clock for that bus cycle. For
a write cycle, all 16 bits of the data bus are driven, regardless of the port width or operand size. The
MCU places the data on the data bus one-half clock cycle after AS is asserted in a write cycle.
3.4.6 Data Strobe
Data strobe (DS) is a timing signal. For a read cycle, the MCU asserts DS to signal an external device
to place data on the bus. DS is asserted at the same time as AS during a read cycle. For a write cycle,
DS signals an external device that data on the bus is valid. The MCU asserts DS one full clock cycle
after the assertion of AS during a write cycle.
3.4.7 Bus Cycle Termination Signals
During bus cycles, external devices assert the data transfer and size acknowledge signals (DSACK1
and DSACK0). During a read cycle, the signals tell the MCU to terminate the bus cycle and to latch data.
During a write cycle, the signals indicate that an external device has successfully stored data and that
the cycle can end. These signals also indicate to the MCU the size of the port for the bus cycle just com-
pleted. (Refer to 3.4.9 Dynamic Bus Sizing.)
The bus error (BERR) signal is also a bus cycle termination indicator and can be used in the absence
of DSACK1 and DSACK0 to indicate a bus error condition. It can also be asserted in conjunction with
these signals, provided it meets the appropriate timing requirements. The internal bus monitor can be
used to generate the BERR signal for internal and internal-to-external transfers. When BERR and HALT
are asserted simultaneously, the CPU takes a bus error exception.
Autovector signal (AVEC) can terminate external IRQ pin interrupt acknowledge cycles. AVEC indicates
that the MCU will internally generate a vector number to locate an interrupt handler routine. If it is con-
tinuously asserted, autovectors will be generated for all external interrupt requests. AVEC is ignored
during all other bus cycles.
3.4.8 Data Transfer Mechanism
The MCU architecture supports byte, word, and long-word operands, allowing access to 8- and 16-bit
data ports through the use of asynchronous cycles controlled by the data transfer and size acknowledge
inputs (DSACK1 and DSACK0).
3.4.9 Dynamic Bus Sizing
The MCU dynamically interprets the port size of the addressed device during each bus cycle, allowing
operand transfers to or from 8- and 16-bit ports. During an operand transfer cycle, the slave device sig-
nals its port size and indicates completion of the bus cycle to the MCU through the use of the DSACK0
and DSACK1 inputs, as shown in the following table.
Table 10 Effect of DSACK Signals
DSACK1
DSACK0
Result
1
Insert Wait States in Current Bus Cycle
1
0
Complete Cycle —Data Bus Port Size is 8 Bits
0
1
Complete Cycle —Data Bus Port Size is 16 Bits
0
Reserved
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相關(guān)代理商/技術(shù)參數(shù) |
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| MC68331CFC25 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Freescale Semiconductor 功能描述: |
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| MC68331CFV16 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:User’s Manual |
| MC68331CFV20 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:User’s Manual |
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