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| 型號： | PONE-000-01 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | The ideal device for simple nodes, such as switches, actuators and sensor |
| 中文描述： | 在簡單的節(jié)點，如交換機，執(zhí)行器和傳感器的理想設(shè)備 |
| 文件頁數(shù)： | 35/56頁 |
| 文件大?。?/td> | 432K |
| 代理商： | PONE-000-01 |
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March 2000
CEWay
PL-One Data Sheet
D-CW-0100-04
Page 35 of 56
M8052 8-Bit Microcontroller
The M8052 is a high performance 8-bit microcontroller. It is software-compatible (including instruction
execution times) with the industry standard 8052AH and 8752BH discrete devices. It can address internal
Data Memory of up to 256 bytes. The M8052 can also address 64 kbytes of external Data RAM, and 64
kbytes of external Program ROM via the I/O ports. Three 16-bit timer/counters are provided as well as a
full-duplex serial port (UART). The M8052 has 31 external port pins. The M8052 has a power saving mode
called Idle mode. In Idle mode, the clock to the CPU is stopped but the timer/counters and serial port are
still active.
MEMORY MAP
Memory Connection
The M8052 has separate program and data memory. Both internal and external data memory can be
accessed, while only external program memory can be accessed. External memory accesses use port 0
as a multiplexed address and data bus and port 2 for the high order address lines. ALE is used to latch the
lower-order address which appears on port 0. PSEN* is the program memory read strobe, RD* is the data
memory read strobe and WR* is the data memory write strobe.
Program Memory
Up to 64 kbytes of external program memory can be accessed directly. More can be accessed if a bank-
switching scheme is implemented.
Data Memory
Internal Data Memory
Internal data memory for the M8052 is 256 bytes. The whole internal data memory is accessible using
indirect addressing, but only the lower 128 bytes are accessible using direct addressing. The upper 128
bytes of direct address data memory space are used to access SFRs (see below).
Register Banks
There are four directly addressable register banks switched between using the PSW (see below), which
occupy data memory space from 00 hex to 1F hex.
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