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AT89C51AC3-RDTIM 数据表(PDF) 53 Page - ATMEL Corporation

部件名 AT89C51AC3-RDTIM
功能描述  Enhanced 8-bit Microcontroller with 64KB Flash Memory
PDF  140 Pages
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制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

AT89C51AC3-RDTIM 数据表(HTML) 53 Page - ATMEL Corporation

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53
AT89C51AC3
4383D–8051–02/08
Operation Cross Memory Access
Space addressable in read and write are:
•
RAM
•
ERAM (Expanded RAM access by movx)
•
XRAM (eXternal RAM)
•
EEPROM DATA
•
FM0 ( user flash )
•
Hardware byte
•
XROW
•
Boot Flash
•
Flash Column latch
The table below provide the different kind of memory which can be accessed from differ-
ent code location.
Note:
1. RWW: Read While Write
Table 18. Cross Memory Access
Action
RAM
XRAM
ERAM
Boot FLASH
FM0
E² Data
Hardware
Byte
XROW
boot FLASH
Read
OK
OK
OK
OK
-
Write
-
OK(1)
OK(1)
OK(1)
OK(1)
FM0
Read
OK
OK
OK
OK
-
Write
-
OK (idle)
OK(1)
-
OK
External
memory
EA = 0
or Code Roll
Over
Read
-
-
OK
-
-
Write
-
-
OK(1)
-
-



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