實(shí)現MAXQ2000微控制器的JTAG加載主機
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對于其他的MAXQ啟動(dòng)加載程序，MAXQ2000啟動(dòng)加載程序提供的命令被劃分成從0到15的命令集。每一命令以命令字節開(kāi)始，它包括命令集(前四個(gè)比特)以及命令專(zhuān)用數(后四個(gè)比特)，如表5所示。作為一般規則，命令集0的命令本質(zhì)上用于提供信息，所有器件均采用它；其他命令集可選。為確定某一MAXQ器件支持的命令集，請參考器件文檔。命令集0的命令05h (獲得支持的命令)返回一個(gè)位掩碼，說(shuō)明啟動(dòng)加載程序支持的其他命令集。
MAXQ2000支持以下的啟動(dòng)加載程序命令集。
- 命令集0—信息和狀態(tài)。該集的命令可用于獲得MAXQ器件的基本信息，包括ROM/啟動(dòng)加載程序的標識和版本，最近命令的結果(狀態(tài)碼)，程序和數據存儲器的容量等。該集還包括主機擦除命令，清除器件所有的程序和數據存儲器。
- 命令集1—裝入可變長(cháng)度。該集中的這一命令可用于裝入程序(閃存)或者數據(RAM)存儲器。
- 命令集2—卸載可變長(cháng)度。該集中的這一命令可用于讀取程序或者數據存儲器的內容。
- 命令集3—CRC可變長(cháng)度。該集中的這一命令可用于獲得對某一范圍程序或者數據存儲器計算得到的CRC-16值。
- 命令集4—驗證可變長(cháng)度。該集中的這一命令可用于驗證某一范圍的程序或者數據存儲器是否和JTAG主機提供的數據匹配。
- 命令集5—裝入和驗證可變長(cháng)度。該集中的這一命令在一個(gè)命令中結合了裝入和驗證命令的功能。
- 命令集6—擦除可變長(cháng)度。對于MAXQ2000，該命令可用于把數據RAM中的某一區域清零。
- 命令集7—擦除固定長(cháng)度。對于MAXQ2000，該命令可用于擦除閃存程序存儲器中的每一頁(yè)面，而不必利用主機擦除命令將所有閃存一次擦除。
表5. MAXQ加載程序命令集
| Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 | Code | Family/Command |
| 0 | 0 | 0 | 0 | x | x | x | x | 0 x h | Family 0—Informational Commands |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 00h | No Operation |
| 0 | 0 | 0 | 1 | 01h | Exit Loader | ||||
| 0 | 0 | 1 | 0 | 02h | Master Erase | ||||
| 0 | 0 | 1 | 1 | 03h | Password Match | ||||
| 0 | 1 | 0 | 0 | 04h | Get Status | ||||
| 0 | 1 | 0 | 1 | 05h | Get Supported Commands | ||||
| 0 | 1 | 1 | 0 | 06h | Get Code Memory Size | ||||
| 0 | 1 | 1 | 1 | 07h | Get Data Memory Size | ||||
| 1 | 0 | 0 | 0 | 08h | Get Loader Version | ||||
| 1 | 0 | 0 | 1 | 09h | Get Utility ROM Version | ||||
| 1 | 0 | 1 | 0 | 0Ah | Set Word/Byte Access Mode | ||||
| 1 | 1 | 0 | 1 | 0Dh | Get ID Information | ||||
| 0 | 0 | 0 | 1 | x | x | x | x | 1 x h | Family 1—Variable-Length Load |
| 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 10h | Load Code Variable Length |
| 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 11h | Load Data Variable Length |
| 0 | 0 | 1 | 0 | x | x | x | x | 2 x h | Family 2—Variable-Length Dump |
| 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 20h | Dump Code Variable Length |
| 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 21h | Dump Data Variable Length |
| 0 | 0 | 1 | 1 | x | x | x | x | 3 x h | Family 3—Variable-Length CRC |
| 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 30h | CRC Code Variable Length |
| 0 | 0 | 1 | 1 | 0 | 0 | 0 | 1 | 31h | CRC Data Variable Length |
| 0 | 1 | 0 | 0 | x | x | x | x | 4 x h | Family 4—Variable-Length Verify |
| 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 40h | Verify Code Variable Length |
| 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 41h | Verify Data Variable Length |
| 0 | 1 | 0 | 1 | x | x | x | x | 5 x h | Family 5—Variable-Length Load and Verify |
| 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 50h | Load/Verify Code Variable Length |
| 0 | 1 | 0 | 1 | 0 | 0 | 0 | 1 | 51h | Load/Verify Data Variable Length |
| 0 | 1 | 1 | 0 | x | x | x | x | 6 x h | Family 6—Variable-Length Erase |
| 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 60h | Erase Code Variable Length |
| 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 61h | Erase Data Variable Length |
| 0 | 1 | 1 | 1 | x | x | x | x | 7 x h | Family 7—Reserved (for expansion) |
| 1 | 0 | 0 | 0 | x | x | x | x | 8 x h | Family 8—Reserved (for expansion) |
| 1 | 0 | 0 | 1 | x | x | x | x | 9 x h | Family 9—Fixed-Length Load |
| 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 90h | Load Code Fixed Length |
| 1 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 91h | Load Data Fixed Length |
| 1 | 0 | 1 | 0 | x | x | x | x | A x h | Family A —Fixed-Length Dump |
| 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | A0h | Dump Code Fixed Length |
| 1 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | A1h | Dump Data Fixed Length |
| 1 | 0 | 1 | 1 | x | x | x | x | B x h | Family B—Fixed-Length CRC |
| 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | B0h | CRC Code Fixed Length |
| 1 | 0 | 1 | 1 | 0 | 0 | 0 | 1 | B1h | CRC Data Fixed Length |
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