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參數(shù)資料
| 型號： | MC68CK338CPV14 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 14.4 MHz, MICROCONTROLLER, PQFP144 |
| 封裝： | PLASTIC, TQFP-144 |
| 文件頁數(shù)： | 54/133頁 |
| 文件大小： | 944K |
| 代理商： | MC68CK338CPV14 |
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MC68CK338
MOTOROLA
MC68CK338TS/D
27
3.5.2 Function Codes
The CPU32L automatically generates function code signals FC[2:0]. The function codes can be consid-
ered address extensions that automatically select one of eight address spaces to which an address ap-
plies. These spaces are designated as either user or supervisor, and program or data spaces. Address
space seven is designated CPU space. CPU space is used for control information not normally associ-
ated with read or write bus cycles. Function codes are valid while AS is asserted. Table 14 displays
CPU32L address space encodings.
3.5.3 Address Bus
Address bus signals ADDR[23:0] define the address of the most significant byte to be transferred during
a bus cycle. The MCU places the address on the bus at the beginning of a bus cycle. The address is
valid while AS is asserted.
3.5.4 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.
3.5.5 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.
Table 13 Size Signal Encoding
SIZ1
SIZ0
Transfer Size
0
1
Byte
1
0
Word
1
Three Byte
0
Long Word
Table 14 CPU32L Address Space Encoding
FC2
FC1
FC0
Address Space
0
Reserved
0
1
User Data Space
0
1
0
User Program Space
0
1
Reserved
1
0
Reserved
1
0
1
Supervisor Data Space
1
0
Supervisor Program Space
1
CPU Space
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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