參數(shù)資料
型號(hào)： P89LV51RB2
廠商： NXP Semiconductors N.V.
元件分類： 8位微控制器
英文描述： 8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
中文描述： 8位80C51的3 V低功耗16/32/64 kB閃存1 KB RAM內(nèi)存控制器
文件頁(yè)數(shù)： 16/77頁(yè)
文件大?。?/td> 349K
代理商： P89LV51RB2
Philips Semiconductors
P89LV51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
Product data
Rev. 04 — 02 December 2004
16 of 77
9397 750 14342
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
7.1.4
Brown-out detect reset
The device includes a brown-out detection circuit to protect the system from severe
supply voltage fluctuations. The P89LV51RB2/RC2/RD2's brown-out detection
threshold is 2.35 V. When V
DD
drops below this voltage threshold, the brown-out
detect triggers the circuit to generate a brown-out interrupt but the CPU still runs until
the supplied voltage returns to the brown-out detection voltage V
BOD
. The default
operation for a brown-out detection is to cause a processor reset.
V
DD
must stay below V
BOD
at least four oscillator clock periods before the brown-out
detection circuit will respond.
Brown-out interrupt can be enabled by setting the EBO bit (IEA.3). If EBO bit is set
and a brown-out condition occurs, a brown-out interrupt will be generated to execute
the program at location 004BH. It is required that the EBO bit be cleared by software
after the brown-out interrupt is serviced. Clearing EBO bit when the brown-out
condition is active will properly reset the device. If brown-out interrupt is not enabled,
a brown-out condition will reset the program to resume execution at location 0000H.
A brown-out detect reset will clear the BSEL bit (FCF.0) but will not change the SWR
bit (FCF.1) and therefore will not change the banking of the lower 8 kB of user code
memory space.
7.1.5
Watchdog reset
Like a brown-out detect reset, the watchdog timer reset will clear the BSEL bit (FCF.0)
but will not change the SWR bit (FCF.1) and therefore will not change the banking of
the lower 8 kB of user code memory space.
The state of the SWR and BSEL bits after different types of resets is shown in
Table 6
. This results in the code memory bank selections as shown.
7.1.6
Data RAM memory
The data RAM has 1024 bytes of internal memory. The device can also address up to
64 kB for external data memory.
7.1.7
Expanded data RAM addressing
The P89LV51RB2/RC2/RD2 has 1 kB of RAM. See
Figure 6 “Internal and external
data memory structure.” on page 19
.
The device has four sections of internal data memory:
1. The lower 128 bytes of RAM (00H to 7FH) are directly and indirectly addressable.
Table 6:
Reset source
Effects of reset sources on bank selection
SWR bit result
(FCF.1)
External reset
0
Power-on reset
Watchdog reset
x
Brown-out detect reset
BSEL bit result
(FCF.0)
0
addresses from 0000h to
1FFFh
Bootcode (in Block 1)
addresses above
1FFFh
User code (in Block 0)
0
Retains state of SWR bit. If
SWR, BSEL =00 then uses
Bootcode. If SWR, BSEL =
10 then uses user code.
User code (in Block 0)
Software reset
1
0
相關(guān)PDF資料
PDF描述
P89LV51RB2BA 8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
P89LV51RD2BN 8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
P89LV51RD2 8-bit 80C51 3 V low power 64 kB Flash microcontroller with 1 kB RAM
P89LV51RD2BA 8-bit 80C51 3 V low power 64 kB Flash microcontroller with 1 kB RAM
P89LV51RC2 8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
P89LV51RB2BA 功能描述:8位微控制器 -MCU 3V 16K/512 FL 12 CLK ISP/IAP 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT
P89LV51RB2BA,512 功能描述:8位微控制器 -MCU 3V 16K/512 FL 12 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT
P89LV51RB2BBC 功能描述:8位微控制器 -MCU 3V 16K/512 FL 12 CLK ISP/IAP 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT
P89LV51RB2BBC,557 功能描述:8位微控制器 -MCU 3V 16K/512 FL 12 CLK ISP/IAP 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT
P89LV51RC2 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
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