參數(shù)資料
型號： P89V51RC2
廠商： NXP Semiconductors N.V.
英文描述： 8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
中文描述： 8位80C51的5 V低功耗16/32/64 kB閃存1 KB RAM內存控制器
文件頁數(shù)： 18/77頁
文件大小： 350K
代理商： P89V51RC2
Philips Semiconductors
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
Product data
Rev. 03 — 02 December 2004
18 of 77
9397 750 14341
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
When EXTRAM = 0, the expanded RAM is indirectly addressed using the MOVX
instruction in combination with any of the registers R0, R1 of the selected bank or
DPTR. Accessing the expanded RAM does not affect ports P0, P3.6 (WR), P3.7
(RD), or P2. With EXTRAM = 0, the expanded RAM can be accessed as in the
following example.
Expanded RAM Access (Indirect Addressing only):
MOVX@DPTR, A DPTR contains 0A0H
DPTR points to 0A0H and data in ‘A’ is written to address 0A0H of the expanded
RAM rather than external memory. Access to external memory higher than 2FFH
using the MOVX instruction will access external memory (0300H to FFFFH) and will
perform in the same way as the standard 8051, with P0 and P2 as data/address bus,
and P3.6 and P3.7 as write and read timing signals.
When EXTRAM =
1
, MOVX @Ri and MOVX @DPTR will be similar to the standard
8051. Using MOVX @Ri provides an 8-bit address with multiplexed data on Port 0.
Other output port pins can be used to output higher order address bits. This provides
external paging capabilities. Using MOVX @DPTR generates a 16-bit address. This
allows external addressing up the 64 kB. Port 2 provides the high-order eight address
bits (DPH), and Port 0 multiplexes the low order eight address bits (DPL) with data.
Both MOVX @Ri and MOVX @DPTR generates the necessary read and write
signals (P3.6 - WR and P3.7 - RD) for external memory use.
Table 9
shows external
data memory RD, WR operation with EXTRAM bit.
The stack pointer (SP) can be located anywhere within the 256 bytes of internal RAM
(lower 128 bytes and upper 128 bytes). The stack pointer may not be located in any
part of the expanded RAM.
[1]
Access limited to ERAM address within 0 to 0FFH; cannot access 100H to 02FFH.
Table 9:
AUXR
External data memory RD, WR with EXTRAM bit
MOVX @DPTR, A or MOVX A,
@DPTR
ADDR < 0300H
EXTRAM = 0
RD/WR not
asserted
EXTRAM = 1
RD/WR asserted
MOVX @Ri, A or MOVX A, @Ri
ADDR
≥
0300H
RD/WR asserted
ADDR = any
RD/WR not asserted
RD/WR asserted
RD/WR asserted
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P89V51RC2BN 8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
P89V51RD2 8-bit 80C51 5 V low power 64 kB Flash microcontroller with 1 kB RAM
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相關代理商/技術參數(shù)
參數(shù)描述
P89V51RC2BN 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
P89V51RC2FA 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
P89V51RC2FA,512 功能描述:8位微控制器 -MCU 80C51 32K FL / 512 R RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
P89V51RC2FBC 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit 80C51 5 V low power 16/32/64 kB flash microcontroller with 1 kB RAM
P89V51RC2FBC,557 功能描述:8位微控制器 -MCU 80C51 32K FL / 512 R RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
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