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參數(shù)資料
| 型號(hào)： | UPD784907 |
| 廠商： | NEC Corp. |
| 英文描述： | 16-BIT SINGLE-CHIP MICROCONTROLLER |
| 中文描述： | 16位單片機(jī) |
| 文件頁(yè)數(shù)： | 22/98頁(yè) |
| 文件大?。?/td> | 657K |
| 代理商： | UPD784907 |
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μ
PD784907, 784908
22
Data Sheet U11680EJ2V0DS00
7. CPU ARCHITECTURE
7.1 Memory Space
A memory space of 1 Mbyte can be accessed. By using a LOCATION instruction, the mode for mapping internal
data areas (special function registers and internal RAM) can be selected. A LOCATION instruction must always be
executed after a reset, and can be used only once.
(1) When the 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
PD784907
0F100H to 0FFFFH
00000H to 0F0FFH
10000H to 17FFFH
μ
PD784908
0EE00H to 0FFFFH
00000H to 0FDFFH
10000H to 1FFFFH
Caution
The following internal ROM areas, existing at the same addresses as the internal data areas,
cannot be used when the LOCATION 0 instruction is executed:
Part Number
Unusable Area
μ
PD784907
0F100H to 0FFFFH (3,840 bytes)
μ
PD784908
0EE00H to 0FFFFH (4,608 bytes)
External memory
The external memory is accessed in external memory expansion mode.
(2) When the 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
PD784907
FF100H to FFFFFH
00000H to 17FFFH
μ
PD784908
FEE00H to FFFFFH
00000H to 1FFFFH
External memory
The external memory is accessed in external memory expansion mode.
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|---|---|
| UPD784907GF | 16-BIT SINGLE-CHIP MICROCONTROLLER |
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| UPD784908GF | 16-BIT SINGLE-CHIP MICROCONTROLLER |
| UPD784908GF-XXX-3BA | 16-Bit Microcontroller |
| UPD784907GF-XXX-3BA | 16-Bit Microcontroller |
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