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參數(shù)資料
| 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)： | 28/90頁 |
| 文件大小： | 481K |
| 代理商： | MC68331CFC20B1 |
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MOTOROLA
MC68331
34
MC68331TS/D
SPACE —Address Space
Use this option field to select an address space for the chip-select logic. The CPU32 normally operates
in supervisor or user space, but interrupt acknowledge cycles must take place in CPU space.
IPL —Interrupt Priority Level
If the space field is set for CPU space (00), chip-select logic can be used for interrupt acknowledge.
During an interrupt acknowledge cycle, the priority level on address lines ADDR[3:1] is compared to the
value in the IPL field. If the values are the same, a chip select is asserted, provided that other option
register conditions are met. The following table shows IPL field encoding.
This field only affects the response of chip selects and does not affect interrupt recognition by the CPU.
Any level means that chip select is asserted regardless of the level of the interrupt acknowledge cycle.
AVEC —Autovector Enable
0 = External interrupt vector enabled
1 = Autovector enabled
This field selects one of two methods of acquiring the interrupt vector during the interrupt acknowledge
cycle. It is not usually used in conjunction with a chip-select pin.
If the chip select is configured to trigger on an interrupt acknowledge cycle (SPACE = 00) and the AVEC
field is set to one, the chip select automatically generates an AVEC in response to the interrupt cycle.
Otherwise, the vector must be supplied by the requesting device.
The AVEC bit must not be used in synchronous mode, as autovector response timing can vary because
of ECLK synchronization.
3.5.5 Port C Data Register
Bit values in port C determine the state of chip-select pins used for discrete output. When a pin is as-
signed as a discrete output, the value in this register appears at the output. This is a read/write register.
Bit 7 is not used. Writing to this bit has no effect, and it always returns zero when read.
Space Field
Address Space
00
CPU Space
01
User Space
10
Supervisor Space
11
Supervisor/User Space
IPL
Description
000
Any Level
001
IPL1
010
IPL2
011
IPL3
100
IPL4
101
IPL5
110
IPL6
111
IPL7
PORTC — Port C Data Register
$YFFA41
15
8
7
6
5
4
3
2
1
0
NOT USED
0
PC6
PC5
PC4
PC3
PC2
PC1
PC0
RESET:
0
1
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