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參數(shù)資料
| 型號： | MC68LK332GCPV16 |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 22/88頁 |
| 文件大小： | 0K |
| 描述： | IC MCU 32BIT LV GMASK 144-LQFP |
| 標(biāo)準(zhǔn)包裝： | 60 |
| 系列： | M683xx |
| 核心處理器： | CPU32 |
| 芯體尺寸： | 32-位 |
| 速度： | 16.78MHz |
| 連通性： | EBI/EMI，SCI，SPI，UART/USART |
| 外圍設(shè)備： | POR，PWM，WDT |
| 輸入/輸出數(shù)： | 15 |
| 程序存儲器類型： | ROMless |
| RAM 容量： | 2K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 3 V ~ 3.6 V |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 144-LQFP |
| 包裝： | 托盤 |
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MC68332
MOTOROLA
MC68332TS/D
29
ADDR0 also affects the operation of the data multiplexer. During an operand transfer, ADDR[23:1] in-
dicate the word base address of the portion of the operand to be accessed, and ADDR0 indicates the
byte offset from the base.
3.4.11 Misaligned Operands
CPU32 processor architecture uses a basic operand size of 16 bits. An operand is misaligned when it
overlaps a word boundary. This is determined by the value of ADDR0. When ADDR0 = 0 (an even ad-
dress), the address is on a word and byte boundary. When ADDR0 = 1 (an odd address), the address
is on a byte boundary only. A byte operand is aligned at any address; a word or long-word operand is
misaligned at an odd address. The CPU32 does not support misaligned operand transfers.
The largest amount of data that can be transferred by a single bus cycle is an aligned word. If the MCU
transfers a long-word operand via a 16-bit port, the most significant operand word is transferred on the
first bus cycle and the least significant operand word on a following bus cycle.
3.4.12 Operand Transfer Cases
The following table summarizes how operands are aligned for various types of transfers. OPn entries
are portions of a requested operand that are read or written during a bus cycle and are defined by SIZ1,
SIZ0, and ADDR0 for that bus cycle.
NOTES:
1. Operands in parentheses are ignored by the CPU32 during read cycles.
2. Three-byte transfer cases occur only as a result of a long word to byte transfer.
3. The CPU32 does not support misaligned word or long-word transfers.
3.5 Chip Selects
Typical microcontrollers require additional hardware to provide external chip-select signals. Twelve in-
dependently programmable chip selects provide fast two-cycle access to external memory or peripher-
als. Address block sizes of 2 Kbytes to 1 Mbyte can be selected.
Table 11 Operand Alignment
Transfer Case
SIZ1
SIZ0
ADDR0
DSACK1
DSACK0
DATA
[15:8]
DATA
[7:0]
Byte to 8-Bit Port (Even/Odd)
0
1
X
1
0
OP0
(OP0)
Byte to 16-Bit Port (Even)
0
1
0
X
OP0
(OP0)
Byte to 16-Bit Port (Odd)
0
1
0
X
(OP0)
OP0
Word to 8-Bit Port (Aligned)
1
0
1
0
OP0
(OP1)
Word to 8-Bit Port (Misaligned)3
1
0
1
0
OP0
(OP0)
Word to 16-Bit Port (Aligned)
1
0
X
OP0
OP1
Word to 16-Bit Port (Misaligned)3
1
0
1
0
X
(OP0)
OP0
3 Byte to 8-Bit Port (Aligned)2
1
0
1
0
OP0
(OP1)
3 Byte to 8-Bit Port (Misaligned)2, 3
1
0
OP0
(OP0)
3 Byte to 16-Bit Port (Aligned)2
1
0
X
OP0
OP1
3 Byte to 16-Bit Port (Misaligned)2, 3
1
0
X
(OP0)
OP0
Long Word to 8-Bit Port (Aligned)
0
1
0
OP0
(OP1)
Long Word to 8-Bit Port (Misaligned)3
1
0
1
0
OP0
(OP0)
Long Word to 16-Bit Port (Aligned)
0
X
OP0
OP1
Long Word to 16-Bit Port (Misaligned)3
1
0
1
0
X
(OP0)
OP0
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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