參數(shù)資料
型號(hào)： MC68331CFC16B1
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 21/84頁(yè)
文件大?。?/td> 0K
描述： IC MCU 32BIT 16MHZ 132-PQFP
標(biāo)準(zhǔn)包裝： 180
系列： M683xx
核心處理器： CPU32
芯體尺寸： 32-位
速度： 16MHz
連通性： EBI/EMI，SCI，SPI，UART/USART
外圍設(shè)備： POR，PWM，WDT
輸入/輸出數(shù)： 18
程序存儲(chǔ)器類型： ROMless
電壓 - 電源 (Vcc/Vdd)： 4.5 V ~ 5.5 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 132-BQFP 緩沖式
包裝： 托盤
28
MC68331TS/D
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.
Chip-select assertion can be synchronized with bus control signals to provide output enable, read/write
strobes, or interrupt acknowledge signals. Logic can also generate DSACK signals internally. A single
DSACK generator is shared by all circuits. Multiple chip selects assigned to the same address and con-
trol must have the same number of wait states.
Chip selects can also be synchronized with the ECLK signal available on ADDR23.
When a memory access occurs, chip-select logic compares address space type, address, type of ac-
cess, transfer size, and interrupt priority (in the case of interrupt acknowledge) to parameters stored in
chip-select registers. If all parameters match, the appropriate chip-select signal is asserted. Select sig-
nals are active low. Refer to the following block diagram of a single chip-select circuit.
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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