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| 型號(hào)： | 935263122557 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | PLASTIC, QFP-80 |
| 文件頁數(shù)： | 76/76頁 |
| 文件大?。?/td> | 567K |
| 代理商： | 935263122557 |
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Philips Semiconductors
Product specification
P83C557E4/P80C557E4/P89C557E4
Single-chip 8-bit microcontroller
1999 Mar 02
9
6.2.1
Program Memory
The program memory of the P8xC557E4 consists of 32 Kbytes
ROM respectively FEEPROM (”Flash Memory”) on-chip, externally
expandable up to 64 Kbytes. If, during RESET, the EA pin was held
HIGH, the P8xC557E4 executes out of the internal program memory
unless the address exceeds 7FFFH. Locations 8000H through
0FFFFH are then fetched from the external program memory. If the
EA pin was held LOW during RESET the P8xC557E4 fetches all
instructions from the external program memory. The EA input is
latched during RESET and is don’t care after RESET.
The internal program memory content is protected, by setting a
mask programmable security bit (ROM) or by the software
programmable security byte (FEEPROM) respectively, i.e. it cannot
be read out at any time by any test mode or by any instruction in the
external program memory space. The MOVC instructions are the
only ones which have access to program code in the internal or
external program memory. The EA input is latched during RESET
and is ’don’t care’ after RESET. This implementation prevents from
reading internal program code by switching from external program
memory to internal program memory during MOVC instruction or an
instruction that handles immediate data. Table 1 lists the access to
the internal and external program memory with MOVC instructions
when the security feature has been activated.
6.2.2
Internal Data Memory
The internal data memory is divided into three physically separated
parts:
256 bytes of RAM, 768 bytes of AUX-RAM, and a 128 bytes special
function area. These can be addressed each in a different way (see
also Table 2).
– RAM 0 to 127 can be addressed directly and indirectly as in the
80C51. Address pointers are R0 and R1 of the selected
registerbank.
– RAM 128 to 255 can only be addressed indirectly.
Address pointers are R0 and R1 of the selected registerbank.
– AUX-RAM 0 to 767 is also indirectly addressable as external
DATA MEMORY locations 0 to 767 via MOVX-Datapointer
instruction, unless it is disabled by setting ARD = 1.
AUX-RAM 0 to 767 is indirectly addressable via pageregister
(XRAMP) and MOVX-Ri instructions, unless it is disabled by
setting ARD = 1 (see Figure 5).
When executing from internal program memory, an access to
AUX-RAM 0 to 767 will not affect the ports P0, P2, P3.6 and P3.7.
An access to external DATA MEMORY locations higher than 767
will be performed with the MOVX @ DPTR instructions in the
same way as in the 80C51 structure, so with P0 and P2 as
data/address bus and P3.6 and P3.7 as write and read timing
signals. Note that the external DATA MEMORY cannot be
accessed with R0 and R1 as address pointer if the AUX-RAM is
enabled (ARD = 0, default).
– The Special Function Registers (SFR) can only be addressed
directly in the address range from 128 to 255 (see Table 5).
– Four register banks, each 8 registers wide, 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 bytes RAM.The stack depth
is only limited by the available internal RAM space of 256 bytes
(see Figure 7).
All registers except the program counter and the four register
banks reside in the Special Function Register address space.
Table 1.
Memory Access by the MOVC Instruction for Protected ROMs
MOVC LOCATION
ACCESS TO INTERNAL
PROGRAM MEMORY
ACCESS TO EXTERNAL
PROGRAM MEMORY
MOVC in internal program memory
YES
MOVC in external program memory
NO
YES
NOTE:
1.
If the security feature has not been activated, there are no restrictions for MOVC instructions.
Table 2.
Internal Data Memory Map
LOCATION
ADDRESSED
RAM
0 to 127
Direct and indirect
AUX-RAM
0 to 767
Indirect only with MOVX
RAM
128 to 255
Indirect only
SFR
128 to 255
Direct only
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