CN111176694A

CN111176694A - Multi-paging burning method for OTP type MCU

Info

Publication number: CN111176694A
Application number: CN201911421197.5A
Authority: CN
Inventors: 方马龙
Original assignee: Wuxi Xijie Microelectronics Co ltd
Current assignee: Wuxi Xijie Microelectronics Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-05-19
Anticipated expiration: 2039-12-31
Also published as: CN111176694B

Abstract

The invention relates to the technical field of OTP type MCU burning methods, in particular to a multi-paging burning method for an OTP type MCU, which comprises the following steps: based on that when the MCU is powered on, a plurality of configuration options defined by a user can be loaded in the preheating period of the circuit system to adapt to different schemes, in the configuration word area of the MCU, the first configuration option is set as a paging option, the system selects and loads configuration words with different addresses according to different pages to adapt to different programs, the address of the program area in the hardware circuit is provided by a program counter PC pointer, and the PC signal is processed when different pages are selected. The invention can burn a plurality of programs by one OTP type MCU, and a user only needs to select one of the programs to operate according to requirements, thereby not only greatly reducing the burning time of MCU scheme design manufacturers, but also shortening the stocking cycle and the cost.

Description

Multi-paging burning method for OTP type MCU

Technical Field

The invention relates to the technical field of OTP type MCU burning methods, in particular to a multi-paging burning method for an OTP type MCU.

Background

At present, the conventional OTP (i.e. One Time programmable) type MCU can only be burned once, while the cost of the OTP type MCU with 1K ROM capacity is almost the same as that of the OTP type MCU with smaller ROM capacity, MCU scheme design manufacturers often choose to purchase 1K OTP type MCU for program burning, as shown in fig. 1, for the existing OTP type MCU burning design, the ROM area is usually divided into a user configuration word area and a program area, but with the development of portable electronic products, more and more simple and variable design schemes appear according to the user's usage requirements, and accordingly, more and more short programs in the MCU market need to be burned, and for MCU scheme design manufacturers, the burning program required by the client often cannot fill up the 1K ROM space of the MCU, which is easy to cause MCU waste, and if the OTP type MCU with different specifications and smaller capacity is purchased according to different program contents, this results in a complicated stock plan, which in turn results in high stock cost and long stock cycle.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a multi-paging burning method for an OTP type MCU.

In order to achieve the technical purpose, the technical scheme of the invention is as follows:

a multi-time paging burning method for OTP type MCU is based on that when MCU is powered on, multiple configuration options defined by user can be loaded in preheating period of circuit system to adapt different schemes, in configuration word region of MCU, the first configuration option is set as paging option, system selects and loads configuration words with different addresses according to different paging to adapt different programs, address of program region in hardware circuit is provided by program counter PC pointer, and PC signal is processed when different paging is selected.

From the above description, it can be seen that the present invention has the following advantages:

the multi-paging burning method for the OTP type MCU can burn a plurality of programs by one OTP type MCU, and when a design manufacturer of the MCU goes out of a product, a customer only needs to select one of the programs to operate according to requirements, so that the burning time of the design manufacturer of the MCU scheme can be greatly shortened (a plurality of programs are burned in the same MCU at one time, the burning time is greatly saved), and the product preparation period and the cost can be reduced.

Drawings

FIG. 1 is a schematic diagram of a ROM region of a conventional OTP type MCU;

FIG. 2 is a schematic diagram of a ROM setup of an OTP type MCU according to the present invention;

fig. 3 is a circuit schematic of the present invention.

Detailed Description

An embodiment of the present invention is described in detail with reference to fig. 1 to 3, but the present invention is not limited in any way by the claims.

A multi-paging burning method for an OTP type MCU is characterized in that: based on that when the MCU is powered on, a plurality of configuration options defined by a user can be loaded in the preheating period of the circuit system to adapt to different schemes, in the configuration word area of the MCU, the first configuration option is set as a paging option, the system selects and loads configuration words with different addresses according to different pages to adapt to different programs, the address of the program area in the hardware circuit is provided by a program counter PC pointer, and the PC signal is processed when different pages are selected.

The following is an example of the specific application of the above method:

taking an OTP MCU with 1K memory space as an example, usually, when the MCU is powered on, a plurality of configuration options customized by a user are loaded during system warm-up to adapt to different schemes, as shown in fig. 1;

first, setting a first configuration option as a paging option, selecting a configuration word corresponding to a program page according to different pages by the system, assuming that the configuration word 0 has 16 bits, as shown in table 1:

TABLE 1

Bit15	Bit14	Bit13	Bit12	……	Bit0
						Bank_num1	Bank_num0	Bank_sel1	Bank_sel0	……

The paging option settings in table 1 are as follows:

bank _ num <1:0 >: selecting the number of pages to be paged

Bnak _ sel <1:0 >: selecting pages for program execution

Bank _ num 00: select 1K ROM, no paging

Bank _ num is 01: select 0.5K ROM, split into two pages

Bank _ num is 10: select 0.25K ROM, divide into four pages

Bank _ sel ═ 00: selecting a first page

Bank _ sel ═ 01: selecting the second page

Bank _ sel ═ 10: selecting the third page

Bank _ sel ═ 11: select the fourth page

Then, the configuration words loaded with different addresses are selected according to different pages to apply different programs, as shown in table 2:

TABLE 2

	Bank_sel＝00	Bank_sel＝01	Bank_sel＝10	Bank_sel＝11
					Bank_num＝00	Configuration word loading 1-3
Bank_num＝01	Configuration word loading 1-3	Configuration word loads 4-6
					Bank_num＝10	Configuration word loading 1-3	Configuration word loads 4-6	Configuration word loads 7-9	Configuration word loading a-c

As shown in FIG. 2, the original 1K ROM area can store two programs within 0.5K and 4 programs within 0.25K based on the above page design.

In the above-mentioned paging design method, the address of the program area in the circuit is provided by the program counter PC pointer, and the PC signal is processed when different pages are selected.

The PC address of 1K is 10 bits PC <9:0>, and the paged PC pointer design is shown in Table 3:

TABLE 3

	First page	Second page	Third page	Fourth page
					Non-paging	PC<9:8>Is not processed
Divided into two pages	PC<9>Is fixed to 0	PC<9>Fixed as 1
					Divided into four pages	PC<9:8>Fixed as 00	PC<9:8>Fixed to 01	PC<9:8>Fixed at 10	PC<9:8>Is fixed at 11

The circuit schematic of the above design is shown in fig. 3.

It can be seen from the above embodiments that, based on the paging burning method for OTP MCU of the present invention, two programs within 0.5K or 4 programs within 0.25K can be burned in the original 1K ROM area of MCU, the ROM space is fully utilized, when the MCU scheme design manufacturer is in shipment, the customer only needs to select one of the programs to operate as required, which not only can greatly shorten the burning time of the MCU scheme design manufacturer (burn multiple programs in the same MCU at one time, greatly saving the burning time), but also can reduce the stocking cycle and cost.

In summary, the invention has the following advantages:

It should be understood that the detailed description of the invention is merely illustrative of the invention and is not intended to limit the invention to the specific embodiments described. It will be appreciated by those skilled in the art that the present invention may be modified or substituted equally as well to achieve the same technical result; as long as the use requirements are met, the method is within the protection scope of the invention.

Claims

1. A multi-paging burning method for an OTP type MCU is characterized in that: based on that when the MCU is powered on, a plurality of configuration options defined by a user can be loaded in the preheating period of the circuit system to adapt to different schemes, in the configuration word area of the MCU, the first configuration option is set as a paging option, the system selects and loads configuration words with different addresses according to different pages to adapt to different programs, the address of the program area in the hardware circuit is provided by a program counter PC pointer, and the PC signal is processed when different pages are selected.