參數(shù)資料
型號(hào): P89V51RD2
廠商: NXP Semiconductors N.V.
英文描述: 8-bit 80C51 5 V low power 64 kB Flash microcontroller with 1 kB RAM
中文描述: 8位80C51的5 V低功耗64 kB閃存1 KB RAM內(nèi)存控制器
文件頁(yè)數(shù): 19/77頁(yè)
文件大?。?/td> 350K
代理商: P89V51RD2
Philips Semiconductors
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
Product data
Rev. 03 — 02 December 2004
19 of 77
9397 750 14341
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
7.1.8
Dual data pointers
The device has two 16-bit data pointers. The DPTR Select (DPS) bit in AUXR1
determines which of the two data pointers is accessed. When DPS = 0, DPTR0 is
selected; when DPS =
1
, DPTR1 is selected. Quickly switching between the two data
pointers can be accomplished by a single INC instruction on AUXR1 (see
Figure 7
).
Fig 6.
Internal and external data memory structure.
000H
2FFH
00H
FFH
UPPER 128 BYTES
INTERNAL RAM
LOWER 128 BYTES
INTERNAL RAM
(INDIRECT & DIRECT
ADDRESSING)
(INDIRECT
ADDRESSING)
(DIRECT
ADDRESSING)
SPECIAL
FUNCTION
REGISTERS (SFRs)
80H
FFH
FFFFH
000H
EXTERNAL
DATA
MEMORY
EXTERNAL
DATA
MEMORY
2FFH
0000H
EXTRAM = 0
EXTRAM = 1
EXPANDED RAM
0300H
(INDIRECT
ADDRESSING)
(INDIRECT
ADDRESSING)
(INDIRECT
ADDRESSING)
FFFFH
80H
7FH
002aaa517
EXPANDED
RAM
768 Bytes
Fig 7.
Dual data pointer organization.
DPL
82H
DPS = 0
DPTR0
DPS = 1
DPTR1
external data memory
DPS
002aaa518
DPH
83H
DPTR0
DPTR1
AUXR1 / bit0
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P89V51RD2BN 制造商:NXP Semiconductors 功能描述:IC MCU 8BIT 80C51 64K FLASH DIP40 制造商:NXP Semiconductors 功能描述:IC, MCU 8BIT 80C51 64K FLASH, DIP40
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P89V51RD2FA 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 64K FLASH PLCC44
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P89V51RD2FA512 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 40MHZ LCC-44