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參數(shù)資料
| 型號： | μPD784225Y |
| 廠商： | NEC Corp. |
| 英文描述： | 16 Bit Single Chip Microcontrollers(16 位單片微控制器) |
| 中文描述： | 16位單片機微控制器（16位單片微控制器） |
| 文件頁數(shù)： | 18/68頁 |
| 文件大?。?/td> | 278K |
| 代理商： | ΜPD784225Y |
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18
μ
PD784224Y, 784225Y
6. CPU ARCHITECTURE
6.1 Memory Space
A memory space of 1 MByte can be accessed. Mapping of the internal data area (special function registers and
internal RAM) can be specified the LOCATION instruction. The LOCATION instruction must be always executed
after RESET cancellation, and must not be used more than once.
(1) When LOCATION 0 instruction is executed
Internal memory
The internal data area and internal ROM area are mapped as follows:
Part Number
Internal Data Area
Internal ROM Area
μ
PD784224Y
0F100H-0FFFFH
00000H-0F0FFH
10000H-17FFFH
μ
PD784225Y
0EE00H-0FFFFH
00000H-0EDFFH
10000H-1FFFFH
Caution
The following areas that overlap the internal data area of the internal ROM cannot be used when
the LOCATION 0 instruction is executed.
Part Number
Unusable Area
μ
PD784224Y
0F100H-0FFFFH (3840 Bytes)
μ
PD784225Y
0EE00H-0FFFFH (4608 Bytes)
External memory
The external memory is accessed in external memory expansion mode.
(2) When LOCATION 0FH instruction is executed
Internal memory
The internal data area and internal ROM area are mapped as follows:
Part Number
Internal Data Area
Internal ROM Area
μ
PD784224Y
FF100H-FFFFFH
00000H-17FFFH
μ
PD784225Y
FEE00H-FFFFFH
00000H-1FFFFH
External memory
The external memory is accessed in external memory expansion mode.
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