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| 型號： | 935225410112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PDIP40 |
| 封裝： | 0.600 INCH, PLASTIC, DIP-40 |
| 文件頁數(shù)： | 8/67頁 |
| 文件大小： | 400K |
| 代理商： | 935225410112 |
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1998 Apr 07
16
Philips Semiconductors
Product specication
8-bit Flash microcontrollers
P89C738; P89C739
Fig.9 Internal and external data memory address space.
handbook, full pagewidth
MBK524
INDIRECT ONLY
DIRECT AND
INDIRECT
AUXILIARY
RAM
SFRs
255
127
0
EXTERNAL
(EA = 0)
INTERNAL
(EA = 1)
MAIN RAM
INTERNAL DATA MEMORY
EXTERNAL
PROGRAM MEMORY
64 kbytes
0
OVERLAPPED SPACE
256
8.3
Addressing
The P89C738 has five modes for addressing:
Register
Direct
Register-Indirect
Immediate
Base-Register plus Index-Register-Indirect.
The first three methods can be used for addressing
destination operands. Most instructions have a
‘destination/source’ field that specifies the data type,
addressing methods and operands involved.
For operations other than MOVs, the destination operand
is also a source operand.
Access to memory addresses is as follows:
Register in one of the four 8-bit register banks through
Register, Direct or Register-Indirect addressing
512 bytes of internal RAM through Direct or
Register-Indirect addressing. Bytes 0 to 127 of internal
RAM may be addressed directly/indirectly. Bytes
128 to 255 of internal RAM share their address location
with the SFRs and so may only be addressed indirectly
as data RAM. Bytes 0 to 255 of AUX-RAM can only be
addressed indirectly via MOVX.
SFR through Direct addressing at address locations
128 to 255
External data memory through Register-Indirect
addressing
Program memory look-up tables through Base-Register
plus Index-Register-Indirect addressing.
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