參數(shù)資料
型號(hào)： P89LPC9402FBD,557
廠商： NXP Semiconductors
文件頁(yè)數(shù)： 38/60頁(yè)
文件大?。?/td> 0K
描述： IC 80C51 MCU FLASH 8K 64-LQFP
標(biāo)準(zhǔn)包裝： 450
系列： LPC900
核心處理器： 8051
芯體尺寸： 8-位
速度： 18MHz
連通性： I²C，SPI，UART/USART
外圍設(shè)備： 欠壓檢測(cè)/復(fù)位，LCD，LED，POR，PWM，WDT
輸入/輸出數(shù)： 23
程序存儲(chǔ)器容量： 8KB（8K x 8）
程序存儲(chǔ)器類型： 閃存
RAM 容量： 256 x 8
電壓 - 電源 (Vcc/Vdd)： 2.4 V ~ 3.6 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 64-LQFP
包裝： 托盤
其它名稱： 935288631557
P89LPC9402_1
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 22 April 2009
43 of 60
NXP Semiconductors
P89LPC9402
8-bit microcontroller with accelerated two-clock 80C51 core
in components and circuit board area. The ISP function uses ve pins (VDD, VSS, TXD,
RXD, and RST). Only a small connector needs to be available to interface your application
to an external circuit in order to use this feature.
7.28.9 Power-on reset code execution
The P89LPC9402 contains two special ash elements: the Boot Vector and the Boot
Status bit. Following reset, the P89LPC9402 examines the contents of the Boot Status bit.
If the Boot Status bit is set to zero, power-up execution starts at location 0000H, which is
the normal start address of the user’s application code. When the Boot Status bit is set to
a value other than zero, the contents of the Boot Vector are used as the high byte of the
execution address and the low byte is set to 00H.
Table 10 shows the factory default Boot Vector setting for these devices. A
factory-provided bootloader is pre-programmed into the address space indicated and
uses the indicated bootloader entry point to perform ISP functions. This code can be
erased by the user.
Remark: Users who wish to use this loader should take precautions to avoid erasing the
1 kB sector that contains this bootloader. Instead, the page erase function can be used to
erase the rst eight 64-byte pages located in this sector.
A custom bootloader can be written with the Boot Vector set to the custom bootloader, if
desired.
7.28.10 Hardware activation of the bootloader
The bootloader can also be executed by forcing the device into ISP mode during a
power-on sequence (see the P89LPC9402
User manual for specic information). This has
the same effect as having a non-zero status byte. This allows an application to be built that
will normally execute user code but can be manually forced into ISP operation. If the
factory default setting for the Boot Vector (1FH) is changed, it will no longer point to the
factory preprogrammed ISP bootloader code. After programming the ash, the status byte
should be programmed to zero in order to allow execution of the user’s application code
beginning at address 0000H.
7.29 User conguration bytes
Some user-congurable features of the P89LPC9402 must be dened at power-up and
therefore cannot be set by the program after start of execution. These features are
congured through the use of the ash byte UCFG1 and UCFG2. Please see the
P89LPC9402
User Manual for additional details.
7.30 User sector security bytes
There are eight User Sector Security Bytes on the P89LPC9402 device. Each byte
corresponds to one sector. Please see the P89LPC9402
User manual for additional
details.
Table 10.
Default Boot Vector values and ISP entry points
Device
Default
Boot Vector
Default
boot loader
entry point
Default boot loader
code range
1 kB sector
range
P89LPC9402
1FH
1F00H
1E00H to 1FFFH
1C00H to 1FFFH
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