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| 型号： | 935208500112 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, 16 MHz, MICROCONTROLLER, PDIP40 |
| 封装： | 0.600 INCH, PLASTIC, DIP-40 |
| 文件页数： | 6/80页 |
| 文件大小： | 446K |
| 代理商： | 935208500112 |
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1997 Dec 15
14
Philips Semiconductors
Product specication
8-bit microcontrollers
P83C524; P80C528; P83C528
Table 2
Internal and external program memory access with security bit set
INSTRUCTION
ACCESS TO INTERNAL
PROGRAM MEMORY
ACCESS TO EXTERNAL
PROGRAM MEMORY
MOVC in internal program memory
YES
MOVC in external program memory
NO
YES
9.2
Internal Data Memory
The internal data memory is divided into three physically
separated parts: 256 byte of RAM, 256 byte of AUX-RAM,
and a 128 byte special function area (SFR). These parts
can be addressed as follows (see Table 3 and Fig.11):
RAM 0 to 127 can be addressed directly and indirectly
as in the 80C51. Address pointers are R0 and R1 of the
selected register bank.
RAM 128 to 255 can only be addressed indirectly.
Address pointers are R0 and R1 of the selected register
bank.
AUX-RAM 0 to 255 is indirectly addressable as the
external data memory locations 0 to 255 with the MOVX
instructions. Address pointers are R0 and R1 of the
selected register bank and DPTR. When executing from
internal program memory, an access to AUX-RAM 0 to
255 will not affect the ports P0, P2, P3.6 and P3.7.
the SFRs can only be addressed directly in the address
range from 128 to 255.
An access to external data memory locations higher than
255 will be performed with the MOVX DPTR instructions in
the same way as in the 80C51 structure, i.e. with P0 and
P2 as data/address bus and P3.6 and P3.7 as write and
read timing signals (see Figures 7, 8, 9 and 10). Note that
the external data memory cannot be accessed with R0 and
R1 as address pointer.
Fig.11 shows the internal and external data memory
address space. Fig.12 shows the Special Function
Register (SFR) memory map. Four 8-bit register banks
occupy locations 0 through 31 in the lower RAM area. Only
one of these banks may be enabled at a time. The next 16
bytes, locations 32 through 47, contain 128 directly
addressable bit locations.
The stack can be located anywhere in the internal 256 byte
RAM. The stack depth is only limited by the available
internal RAM space of 256 bytes. All registers except the
Program Counter and the four 8-bit register banks reside
in the SFR address space.
Table 3
Internal data memory access
LOCATION
ADDRESSED
RAM 0 to 127
DIRECT and INDIRECT
RAM 128 to 255
INDIRECT only
AUX-RAM 0 to 255
INDIRECT only with MOVX
Special Function Register (SFR) 128 to 255
DIRECT only
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