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參數(shù)資料
| 型號： | AT_8032 |
| 廠商： | Atmel Corp. |
| 英文描述： | 8-bit Embedded Microcontroller Core(8位嵌入式基于工業(yè)標準軟件兼容的微控制器) |
| 中文描述： | 8位嵌入式微控制器核心（8位嵌入式基于工業(yè)標準軟件兼容的微控制器） |
| 文件頁數(shù)： | 4/39頁 |
| 文件大?。?/td> | 532K |
| 代理商： | AT_8032 |
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AT_8032 Core
4
External Program Memory
16 I/O lines are dedicated to the bus for external program
memory fetches. Port 0 is used as a multiplexed
address/data bus. It gives the low byte of the program
counter as an address and waits for the arrival of the code
byte from the program memory. During the time the low
byte of the program counter is available on P0, the ALE sig-
nal clocks this byte into an address latch. Meanwhile, Port
2 provides the high byte of the program counter. Then
PSEN strobes the program memory and the code byte is
read into Port 0.
Program memory addresses are always 16 bits wide even
if the program memory is less than 64K bytes.
Figure 4.
Executing from External Program Memory
Program Memory - Reset and Interrupt
Handling
At reset, the AT_8032 microcontroller executes from pro-
gram address 0000H.
The program memory has fixed 8-byte locations for 8 inter-
rupt service routines. Each interrupt makes the AT_8032
jump directly to the corresponding location. When the
microcontroller is at this location, it begins the execution of
the interrupt service routine.
For example, External Interrupt 0 is assigned to location
0003H. If External Interrupt 0 is going to be used, its ser-
vice routine must be at location 0003H. If not used, this
location can be used as part of the general purpose pro-
gram memory.
If an interrupt service routine is short enough, it can reside
entirely within its 8-byte interval. Longer service routines
can use a jump instruction to skip over subsequent inter-
rupt locations if other interrupts are in use.
Figure 5.
Map of the Lower Part of the Program Memory
PSEN
P2
ALE
EA
P0
8032
ADDR
OE
D
Q
Latch
P1
P3
ROM
Reset
Interrupt
Locations
0000H
0003H
000BH
0013H
001BH
0023H
8 Bytes
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