 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
P89LPC970 Datasheet(PDF) 43 Page - NXP Semiconductors |
|
||||||||||||||||||||||||||||||
P89LPC970 Datasheet(HTML) 43 Page - NXP Semiconductors |
|
|
43 / 66 page  P89LPC97X_2 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 02 — 27 April 2010 43 of 66 NXP Semiconductors P89LPC970/971/972 8-bit microcontroller with accelerated two-clock 80C51 core 7.29.6 ICP ICP is performed without removing the microcontroller from the system. The ICP facility consists of internal hardware resources to facilitate remote programming of the P89LPC970/971/972 through a two-wire serial interface. The NXP ICP facility has made in-circuit programming in an embedded application - using commercially available programmers - possible with a minimum of additional expense in components and circuit board area. The ICP function uses five pins. Only a small connector needs to be available to interface your application to a commercial programmer in order to use this feature. Additional details may be found in the P89LPC970/971/972 User manual. 7.29.7 IAP IAP is performed in the application under the control of the microcontroller’s firmware. The IAP facility consists of internal hardware resources to facilitate programming and erasing. The NXP IAP has made in-application programming in an embedded application possible without additional components. Two methods are available to accomplish IAP. A set of predefined IAP functions are provided in a Boot ROM and can be called through a common interface, PGM_MTP. Several IAP calls are available for use by an application program to permit selective erasing and programming of flash sectors, pages, security bits, configuration bytes, and device ID. These functions are selected by setting up the microcontroller’s registers before making a call to PGM_MTP at FF03H. The Boot ROM occupies the program memory space at the top of the address space from FF00H to FEFFH, thereby not conflicting with the user program memory space. 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 P89LPC970/971/972 User manual. 7.29.8 ISP 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 P89LPC970/971/972 through the serial port. This firmware is provided by NXP and embedded within each P89LPC970/971/972 device. The NXP ISP 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 (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. 7.29.9 Power-on reset code execution The P89LPC970/971/972 contains two special flash elements: the Boot Vector and the Boot Status bit. Following reset, the P89LPC970/971/972 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 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. |
Similar Part No. - P89LPC970 |
|
Similar Description - P89LPC970 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
