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參數(shù)資料
| 型號： | UPD784224YGC |
| 廠商： | NEC Corp. |
| 英文描述： | 16/8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 16/8-BIT單晶片微控制器 |
| 文件頁數(shù)： | 20/92頁 |
| 文件大小： | 687K |
| 代理商： | UPD784224YGC |
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20
μ
PD784224, 784225, 784224Y, 784225Y
Data Sheet U12376EJ1V0DS00
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 0H 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
PD784224,
μ
PD784224Y
0F100H to 0FFFFH
00000H to 0F0FFH
10000H to 17FFFH
μ
PD784225,
μ
PD784225Y
0EE00H to 0FFFFH
00000H to 0EDFFH
10000H to 1FFFFH
Caution
The following areas that overlap the internal data area of the internal ROM cannot be used when
the LOCATION 0H instruction is executed.
Part Number
Unusable Area
μ
PD784224,
μ
PD784224Y
0F100H to 0FFFFH (3,840 bytes)
μ
PD784225,
μ
PD784225Y
0EE00H to 0FFFFH (4,608 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
PD784224,
μ
PD784224Y
FF100H to FFFFFH
00000H to 17FFFH
μ
PD784225,
μ
PD784225Y
FEE00H to FFFFFH
00000H to 1FFFFH
External memory
The external memory is accessed in external memory expansion mode.
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