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參數(shù)資料
| 型號(hào)： | P89LPC938FA |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-bit microcontroller with accelerated two-clock 80C51 core 8 kB 3 V byte-erasable Flash with 10-bit A/D converter |
| 中文描述： | 8-BIT, FLASH, 18 MHz, MICROCONTROLLER, PQCC28 |
| 封裝： | PLASTIC, MS-018, SOT-261-2, LCC-28 |
| 文件頁(yè)數(shù)： | 45/68頁(yè) |
| 文件大?。?/td> | 318K |
| 代理商： | P89LPC938FA |
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9397 750 14051
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 25 February 2005
45 of 68
Philips Semiconductors
P89LPC938
8-bit microcontroller with 10-bit A/D converter
In addition, IAP operations can be accomplished through the use of four SFRs consisting
of a control/status register, a data register, and two address registers. Additional details
may be found in the P89LPC938 User’s Manual
7.28.8
ISP
In-System Programming is performed without removing the microcontroller from the
system. The In-System Programming facility consists of a series of internal hardware
resources coupled with internal firmware to facilitate remote programming of the
P89LPC938 through the serial port. This firmware is provided by Philips and embedded
within each P89LPC938 device. The Philips In-System Programming facility has made
in-system programming in an embedded application possible with a minimum of additional
expense in components and circuit board area. The ISP function uses five pins (V
DD
, V
SS
,
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 P89LPC938 contains two special Flash elements: the Boot Vector and the Boot
Status Bit. Following reset, the P89LPC938 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 is used as the high byte of the
execution address and the low byte is set to 00H.
Table 8
shows the factory default Boot Vector setting for this device. A factory-provided
boot loader is pre-programmed into the address space indicated and uses the indicated
boot loader entry point to perform ISP functions. This code can be erased by the user.
Users who wish to use this loader should take precautions to avoid erasing the
1 kB sector that contains this boot loader. Instead, the page erase function can be
used to erase the first eight 64-byte pages located in this sector.
A custom boot
loader can be written with the Boot Vector set to the custom boot loader, if desired.
7.28.10
Hardware activation of the boot loader
The boot loader can also be executed by forcing the device into ISP mode during a
power-on sequence (see the P89LPC938 User’s Manualfor specific 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 pre-programmed ISP boot loader code. After programming the Flash, the status
byte should be programmed to zero in order to allow execution of the user’s application
code beginning at address 0000H.
Table 8:
Device
Default Boot Vector values and ISP entry points
Default
Boot Vector
Default
boot loader
entry point
1F00H
Defaultboot loader
code range
1 kB sector
range
P89LPC938
1FH
1E00H to 1FFFH
1C00H to 1FFFH
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| P89LPC938FA,129 | 功能描述:8位微控制器 -MCU 80C51 8K FL 768B RAM 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 |
| P89LPC938FA129 | 制造商:NXP Semiconductors 功能描述:P89LPC938FA/PLCC28/TUBESM// |
| P89LPC938FDH | 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 8K FLASH TSSOP28 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 8K FLASH, TSSOP28 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 8K FLASH, TSSOP28, Controller Family/Series:(8051) 8052, Core Siz |
| P89LPC938FDH,529 | 功能描述:8位微控制器 -MCU 80C51 8K FL 768B RAM 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 |
| P89LPC938FDH529 | 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 18MHZ TSSOP-28 |
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