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Chapter IV : 實作練習

Chapter IV : 實作練習. 晶 片 程 式 設 計 中華技術學院電子系. 實習一. BASIC INPUT OUTPUT PORT. ( 一 ) Specification. Hardware: J11(P2) <> J6 ( 七段顯示器 ) J12(P0) <> J13(LED) J9(P1) <> J19(DIP-SW) Software: (1) 七段顯示器由 0 到 F, 每隔 x ms 循環顯示

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Chapter IV : 實作練習

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  1. Chapter IV : 實作練習 晶 片 程 式 設 計 中華技術學院電子系

  2. 實習一 BASIC INPUT OUTPUT PORT

  3. (一) Specification • Hardware: J11(P2) <> J6 (七段顯示器) J12(P0) <> J13(LED) J9(P1) <> J19(DIP-SW) • Software: (1) 七段顯示器由 0 到 F, 每隔 x ms 循環顯示 (2) 偵測 DIP-SW 的內容, 讀取後將相對應資料顯示於 LED 上, 其中 on: LED ON , off: LED OFF (3) 利用DIP-SW值來決定 x, 0000=500, 0001=600, 0010=700,… • Module Planning:

  4. (1) DELAY_01MS PUBLIC DELAY_01MS ROM SEGMENT CODE RSEG ROM DELAY_01MS: MOV R3,#48 NOP DJNZ R3,$ DJNZ R4,DELAY_01MS RET END

  5. (2) DELAY_10MS PUBLIC DELAY_10MS ROM SEGMENT CODE RSEG ROM DELAY_10MS: MOV R4,#100 DELAY1: MOV R3,#48 NOP DJNZ R3,$ DJNZ R4,DELAY1 DJNZ R5,DELAY_10MS RET END

  6. (3) FLOOK_TABLE PUBLIC FLOOK_TABLE ROM SEGMENT CODE RSEG ROM FLOOK_TABLE: MOV A,R1 MOVC A,@A+DPTR MOV R2,A RET END

  7. (4) BLOOK_TABLE PUBLIC BLOOK_TABLE ROM SEGMENT CODE RSEG ROM BLOOK_TABLE: MOV R1,#00H BL1: MOV A,R1 MOVC A,@A+DPTR XRL A,R2 JNZ BL2 JMP BL3 BL2: INC R1 DJNZ R3,BL1 MOV R1,#0FFH BL3: RET END

  8. 實習二 3X4 SCAN KEYBOARD

  9. (一) Keyboard Layout Row1 Row2 1 2 3 Scan Line Row3 4 5 6 Row4 Col1 7 8 9 Return Line Col2 * 0 # Col3 Scan Line : 1110  Trace Row1 (1 2 3)  Return Line Scan Line : 1101  Trace Row2 (4 5 6)  Return Line Scan Line : 1011  Trace Row3 (7 8 9)  Return Line Scan Line : 0111  Trace Row4 (* 0 #)  Return Line

  10. (二) Key Code 9 1 5 0 2 6 1 2 3 * 0 4 5 6 3 7 0 0 7 9 8 4 8 # 0 * 0 #

  11. (三) 程式流程 (C.1) • 檢查是否所有按鍵均被鬆開 SCAN_KEYBOARD: MOV KEY_PORT,#11110000B MOV A,KEY_PORT XRL A,#11110000B JNZ SCAN_KEYBOARD

  12. 程式流程 (C.2) (2) 設定掃描參數 SCAN_4: MOV R2,#7FH MOV R1,#04H (3) 輸出掃描參數 SCAN_3: MOV A,R2 RL A MOV KEY_PORT,A MOV R2,A

  13. 程式流程 (C.3) (4) 輸入返回線 MOV A,KEY_PORT (5) 測試是否有鍵被按? XRL A,R2 JZ SCAN_1 (6) 解彈跳 (Debounce) CALLDELAY (7) 再一次輸入返回線作 Double Check MOV A,KEY_PORT XRL A,R2 JNZ SCAN_2

  14. 程式流程 (C.4) (8) 沒鍵被按 SCAN_1: DJNZ R1,SCAN_3 JMP SCAN_4 • 有鍵被按 SCAN_2: MOV R2,KEY_PORT RET END

  15. (四) Specification • Hardware: J11(P2) <> J2 (3x4KEYBOARD) J12(P0) <> J13(LED) • Software: (1) 設計 SCAN_KEYBOARD 模組 (2) 將讀取到的鍵碼顯示在 P0 的 LED 上 (3) 將讀取到的鍵值顯示在 P0 的七段顯示器上

  16. 實習三 TEXT MODE LCD MODULE

  17. 4-1 HD44780 Feature • Display Data RAM : 80*8 Bytes • Character Generator ROM : 內建160個 5*7 字型 Table 5-5 • Character Generator RAM : 自行規劃 8 個 5*7 字型 Table 5-6 造字 • 四/八位元 MPU Interface • 內建 10 個控制命令碼 Table 5-7 LCD 指令集

  18. 4-2 LCM Pin Layout Pin 4. RS : Register Select RS=0: Instruction Register RS=1: Data Register Pin 5. R/W: Read / Write Pin 6. E : Switch

  19. 4-3 Display Principle • 假如希望在LCD某個位置顯示某個字型, 請將該字型的ASCII碼寫入相對應的DD RAM位址中 1 2 3 4 5 6 7 8 9 10 A F DD RAM (ASCII Code)

  20. 4-4 LCM Access Control • Instruction Register IR: 存取 LCM 指令碼 (only write) • Data Register DR: 存取 LCM 顯示資料 ( read & write) RS R/W Operation Mode 0 0 Command IR 0 1 U’C BF & AC 1 0 Display Data DR 1 1 U’C Display Data

  21. 4-5 LCM Access Timing RS WLCD_COMMAND R/W WLCD_DATA E Data

  22. 4-6 Example

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