參數(shù)資料
型號(hào): MC68HC000IEI16R
廠(chǎng)商: Freescale Semiconductor
文件頁(yè)數(shù): 103/189頁(yè)
文件大?。?/td> 0K
描述: IC MPU 32BIT 16MHZ 68-PLCC
標(biāo)準(zhǔn)包裝: 250
系列: M680x0
處理器類(lèi)型: M680x0 32-位
速度: 16MHz
電壓: 3.3V,5V
安裝類(lèi)型: 表面貼裝
封裝/外殼: 68-LCC(J 形引線(xiàn))
供應(yīng)商設(shè)備封裝: 68-PLCC(25x25)
包裝: 帶卷 (TR)
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2-6
M68000 8-/16-/32-BIT MICROPROCESSOR USER’S MANUAL
MOTOROLA
When a data register is used as either a source or a destination operand, only the
appropriate low-order portion is changed; the remaining high-order portion is neither
used nor changed.
2.3.2 Address Registers
Each address register (and the stack pointer) is 32 bits wide and holds a full, 32-bit
address. Address registers do not support byte-sized operands. Therefore, when an
address register is used as a source operand, either the low-order word or the entire
long-word operand is used, depending upon the operation size. When an address
register is used as the destination operand, the entire register is affected, regardless of
the operation size. If the operation size is word, operands are sign-extended to 32 bits
before the operation is performed.
2.4
DATA ORGANIZATION IN MEMORY
Bytes are individually addressable. As shown in Figure 2-5, the high-order byte of a
word has the same address as the word. The low-order byte has an odd address, one
count higher. Instructions and multibyte data are accessed only on word (even byte)
boundaries. If a long-word operand is located at address n (n even), then the second
word of that operand is located at address n+2.
BYTE 000000
BYTE 000001
WORD 0
WORD 1
BYTE 000003
BYTE 000002
BYTE FFFFFE
WORD 7FFFFF
15
14
13
12
11
10
98765
4
3
2
10
ADDRESS
$000000
$000002
$FFFFFE
Figure 2-5. Word Organization in Memory
The data types supported by the M68000 MPUs are bit data, integer data of 8, 16, and
32 bits, 32-bit addresses, and binary-coded-decimal data. Each data type is stored in
memory as shown in Figure 2-6. The numbers indicate the order of accessing the data
from the processor. For the MC68008 with its 8-bit bus, the appearance of data in
memory is identical to the all the M68000 MPUs. The organization of data in the memory
of the MC68008 is shown in Figure 2-7.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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