CN100592277C - Method for using W83977 chip in a system with a addressing space smaller than 1M - Google Patents
Method for using W83977 chip in a system with a addressing space smaller than 1M Download PDFInfo
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- CN100592277C CN100592277C CN200810140228A CN200810140228A CN100592277C CN 100592277 C CN100592277 C CN 100592277C CN 200810140228 A CN200810140228 A CN 200810140228A CN 200810140228 A CN200810140228 A CN 200810140228A CN 100592277 C CN100592277 C CN 100592277C
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Abstract
The invention provides a method for using a W83977 chip in a system whose address space is less than 1M, the method remaps the address by using an address wire locking mode, base address space conditions are met by pulling up or down a high-bit address wire A15-A5, a low-bit address wire A4-A0 is connected to the corresponding address wire of a singlechip, namely the access of the offset address is realized through connecting the 79,80,85 pins of the W83977 chip with the power VCC in parallel and connecting the 84,86,87,88,89,90,91 pins with ground in parallel, so the function of accessing the big address space within the small address space is realized. The method is already applied to a tax-supervising extension box of tide RE-720FB, in the extension box, W83977 is used in the small address space where the CPU adopts 8086 architecture, and the addressing space is 1M. After the method is applied, the powerful peripheral equipment interface function of W83977 is exerted successfully,and interfaces of a tax-supervising cashing machine are enriched.
Description
Technical field
The present invention relates to a kind of tax controlling equipment improvement technology, specifically a kind ofly use the implementation method of W83977 chip in less than the system of 1M at addressing space.
Background technology
The W83977 of Winbond company is a powerful interface extended chip, support the PS/2 keyboard, mouse, reach 3 serial ports, PCC parallel port and infrared interface, and provide corresponding programmable Interrupt, use the Peripheral Interface that the W83977 chip can enrich embedded device greatly, but because of the W83977 chip is for INTEL80386 and above CPU design at first, when distributing address space, Peripheral Interface all has been defined in the place, address (address that 0x3F0 or 0x370 are above) than high bit, and the addressing of address space of present many single-chip microcomputers has only 64K, and the high address generally keeps as the CPU internal register addresses, in this case, just can not use the W83977 chip of Winbond company to carry out the expansion of interface, be head it off, a kind of implementation method of using the W83977 chip in little address space is provided.
Summary of the invention
The purpose of this invention is to provide and a kind ofly use the method for W83977 chip in less than the system of 1M at addressing space.
The objective of the invention is to realize in the following manner, the mode that adopts address wire to lock is carried out the address and is remapped, with high address line A15-A5 people for drawing high or dragging down, to satisfy the base address space condition, low order address line A4-A0 is connected to the corresponding address line of single-chip microcomputer, promptly by with 79,80,85 pin of W83977 chip and meet power supply VCC, 84,86,87,88,89,90,91 pin and ground wires, realization is to the visit of offset address, thereby realized the function of the big address space of visit in little address space.
The invention has the beneficial effects as follows, this method has been applied on the tide RE-720FB tax control expansion box, in this expansion box, in adopting the little address space of 8086 frameworks, uses CPU the W83977 chip, addressing space is 1M, use after the method for the present invention, successful performance the powerful external apparatus interface function of W83977 chip, enriched the interface of tax-control cash register.
Description of drawings
Accompanying drawing 1 is the wiring construction synoptic diagram of W83977 chip
Embodiment
With reference to Figure of description to explaining below the work of the present invention.
Because of the base address of W83977 chip is 0x3F0 or 0x370, and register skew space is not more than 8K, therefore, the mode that can adopt address wire to lock is carried out the address and is remapped, with high address line A15-A5 people for drawing high or dragging down, to satisfy the base address space condition, low order address line A4-A0 is connected to the corresponding address line of single-chip microcomputer, promptly pass through 79 of W83977 chip, 80,85 pin also meet power supply VCC, 84,86,87,88,89,90,91 pin and ground wire, realization is to the visit of offset address, thereby is implemented in the function of the big address space of visit in the little address space.
Use the method for W83977 chip in the little address space of the present invention, be applied on the tide RE-720FB tax control expansion box, in this expansion box, CPU adopts 8086 frameworks, addressing space is 1M, use after the present invention, successful use the powerful external apparatus interface function of W83977 chip, enriched the interface of tax-control cash register.
Claims (2)
1. one kind is used the method for W83977 chip in less than the system of 1M at addressing space, it is characterized in that in CPU adopts the little address space of 8086 frameworks, using the W83977 chip, addressing space is 1M, the mode that adopts address wire to lock is carried out the address and is remapped, high address line A15-A5 is drawn high or drags down to satisfy the base address space condition, low order address line A4-A0 is connected to the corresponding address line of single-chip microcomputer, promptly pass through 79 of W83977 chip, 80,85 pin also meet power supply VCC, 84,86,87,88,89,90,91 pin and ground wire, realization is to the visit of offset address, thereby is implemented in the function of the big address space of visit in the little address space.
2, method according to claim 1 is characterized in that being applicable to the occasion of using W83977 at addressing space in less than the system of 1M.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810140228A CN100592277C (en) | 2008-09-17 | 2008-09-17 | Method for using W83977 chip in a system with a addressing space smaller than 1M |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810140228A CN100592277C (en) | 2008-09-17 | 2008-09-17 | Method for using W83977 chip in a system with a addressing space smaller than 1M |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101369262A CN101369262A (en) | 2009-02-18 |
| CN100592277C true CN100592277C (en) | 2010-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810140228A Expired - Fee Related CN100592277C (en) | 2008-09-17 | 2008-09-17 | Method for using W83977 chip in a system with a addressing space smaller than 1M |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109407569A (en) * | 2017-08-16 | 2019-03-01 | 浙江西谷数字技术股份有限公司 | A kind of automatic tax location method based on SCM system |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105095095B (en) * | 2014-05-12 | 2018-04-06 | 上海大学 | A kind of computer system and data read-write method |
| CN104134298A (en) * | 2014-08-14 | 2014-11-05 | 浪潮电子信息产业股份有限公司 | Control method for PCI bus interface chip |
| CN106339327B (en) * | 2015-07-06 | 2019-08-20 | 上海大学 | A kind of computer system and blade server cabinet |
| CN105426318B (en) * | 2015-11-12 | 2018-12-25 | 宁波伟依特照明电器有限公司 | A kind of RAM addressing method of PIC single chip microcomputer |
| JP6524989B2 (en) * | 2016-11-15 | 2019-06-05 | トヨタ自動車株式会社 | Operation guarantee method of arithmetic unit |
-
2008
- 2008-09-17 CN CN200810140228A patent/CN100592277C/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
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| 基于嵌入式处理器EP9312的多串口扩展. 张闻捷等.计算机测量与控制，第15卷第8期. 2007 |
| 基于嵌入式处理器EP9312的多串口扩展. 张闻捷等.计算机测量与控制，第15卷第8期. 2007 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109407569A (en) * | 2017-08-16 | 2019-03-01 | 浙江西谷数字技术股份有限公司 | A kind of automatic tax location method based on SCM system |
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| CN101369262A (en) | 2009-02-18 |
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Granted publication date: 20100224 Termination date: 20130917 |