參數(shù)資料
型號: P89LPC935FA
廠商: NXP SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: 8-bit microcontroller with accelerated two-clock 80C51 core 4 kB/8 kB 3 V byte-erasable Flash with 8-bit A/D converters
中文描述: 8-BIT, FLASH, 18 MHz, MICROCONTROLLER, PQCC28
封裝: PLASTIC, MS-018, SOT-261-2, LCC-28
文件頁數(shù): 51/75頁
文件大?。?/td> 372K
代理商: P89LPC935FA
9397 750 15113
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 06 — 20 June 2005
51 of 75
Philips Semiconductors
P89LPC933/934/935/936
8-bit microcontroller with accelerated two-clock 80C51 core
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 P89LPC933/934/935/936 User manual
8.28.8
In-system programming
ISP is performed without removing the microcontroller from the system. The ISP facility
consists of a series of internal hardware resources coupled with internal firmware to
facilitate remote programming of the P89LPC933/934/935/936 through the serial port.
This firmware is provided by Philips and embedded within each P89LPC933/934/935/936
device. The Philips ISP facility has made ISP 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.
8.28.9
Power-on reset code execution
The P89LPC933/934/935/936 contains two special flash elements: the boot vector and
the boot status bit. Following reset, the P89LPC933/934/935/936 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 9
shows the factory default boot vector settings for these devices.
Remark:
These settings are different than the original P89LPC932. Tools designed to
support the P89LPC933/934/935/936 should be used to program this device, such as
Flash Magic version 1.98, or later.
A factory-provided boot loader is preprogrammed 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.
Remark:
Users who wish to use this loader should take precautions to avoid erasing the
sector that contains this boot loader. Instead, the page erase function can be used to
erase the pages located in this sector which are not used by the boot loader.
A custom boot loader can be written with the boot vector set to the custom boot loader, if
desired.
Table 9:
Device
Default boot vector values and ISP entry points
Default
boot vector
Default
boot loader
entry point
0F00H
1F00H
1F00H
3F00H
Defaultboot loader
code range
Boot sector
range
P89LPC933
P89LPC934
P89LPC935
P89LPC936
0FH
1FH
1FH
3FH
0E00H to 0FFFH
1E00H to 1FFFH
1E00H to 1FFFH
3E00H to 3FFFH
0C00H to 0FFFH
1C00H to 1FFFH
1C00H to 1FFFH
3C00H to 3FFFH
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