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參數(shù)資料
| 型號(hào)： | HMS99C58S |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 8-BIT SINGLE-CHIP MICROCONTROLLERS WITH EMBEDDED FLASH |
| 中文描述： | 8位單片機(jī)與嵌入式閃存微控制器 |
| 文件頁(yè)數(shù)： | 49/73頁(yè) |
| 文件大?。?/td> | 696K |
| 代理商： | HMS99C58S |
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HMS99C51S/52S/54S/56S/58S
Sep. 2004 Ver 1.01
45
Cross Flash Memory Access Description
The FM0 and FM1 memory can be programmed by parallel programming.
The FM0 memory can be programmed from FM1. But, programming FM1 from FM0 or from external memory
is impossible.
FM1 memory can be programmed only by parallel programming.
Overview of FM0 Operations
The CPU interfaces to the Flash memory through the FCON register of SFR FCON register is used to:
Select Register for operation of Flash Access (FRSEL[2:0])
Erase Mode Select (ERASESEL)
Enable Boot Flash (ENBOOT)
64K Bytes Internal Rom Access (INTROM_EN)
Program Mode Select (PGMSEL)
Mapping of the Memory Space
By default, the user space is accessed by MOVC instruction for read only.
The other memory spaces (user, BOOT, HSB) are made accessible in the code segment by programming bits
INTROM_EN, ENBOOT in FCON register in advance. A MOVC instruction is then used for reading these
spaces in accordance with address of Table 12.
Action
FM0
(User Flash)
FM1
(Boot Flash)
FM0
Read
OK
-
Write/Erase
-
-
FM1
Read
OK
OK
Write/Erase
OK
-
Table 11. Cross Flash Memory Access
Region
Addr. 15
Addr. 14~11
Addr. 10~7
Addr. 6~0
HSB(1 Bytes)
1
0000
0111
1111
Boot(2K Bytes)
1111
Variable
Variable
User(32K Bytes)
0
Variable
Variable
Variable
Table 12. FM0 Blocks Select Bits
C
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