【正文】 .................................B0 TOI 0 0 0 TCRE PR2 PR1 PR0 1 – 定時器由 OC7 比較事件發(fā)生來復(fù)位 0 – 定時器自由運行 TM Freescale Semiconductor Confidential and Proprietary Information. Freescale? and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. 169。 Freescale Semiconductor, Inc. 2022. Slide 7 輸出比較寄存器 C7F C6F C5F C4F C3F C2F C1F C0F OM7 OL7 OM6 OL6 OM5 OL5 OM4 OL4 1. TC7 – TC0 2. TFLG1 3. TIE 4. TCTL1 比較 /捕捉標(biāo)志位 寫 ‘ 1’清除中斷狀態(tài)標(biāo)志位 比較 /捕捉屏蔽位 0 = 屏蔽中斷請求 1 = 中斷請求允許 OMX OLX Action on OCx 0 0 1 1 0 1 0 1 No Action OCx Toggle OCx Drive OCx LO Drive OCx HI 輸出模式和輸出電平 (O7–OC0) B6 B5 B4 B3 B7 B2 B1 B0 5. TCTL2 B6 B5 B4 B3 B7 B2 B1 B0 RST: 0 0 0 0 0 0 0 0 $0008 RST: 0 0 0 0 0 0 0 0 RST: 0 0 0 0 0 0 0 0 RST: 0 0 0 0 0 0 0 0 $000C $000E $0009 Address Offset $0010 $0011 $001E $001F 16 位捕捉 /比較寄存器 (TC7) 16 位捕捉 /比較寄存器 (TC0) C7F C6F C5F C4F C3F C2F C1F C0F B6 B5 B4 B3 B7 B2 B1 B0 OM3 OL3 OM2 OL2 OM1 OL1 OM0 OL0 B6 B5 B4 B3 B7 B2 B1 B0 FOC7 FOC6 FOC5 FOC4 FOC3 FOC2 FOC1 FOC0 6. CFORC B7 B6 B5 B4 B3 B2 B1 B0 RST: 0 0 0 0 0 0 0 0 $0001 TM Freescale Semiconductor Confidential and Proprietary Information. Freescale? and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. 169。 //timer overflow interrupt enable TSCR1_TEN = 1。 Freescale Semiconductor, Inc. 2022. Slide 3 定時器結(jié)構(gòu) 預(yù)分頻選擇 PR[2:0] M Clock 1 2 4 8 16 32 64 128 TCNT 15...........................................0 DATA BUS PIN R R R R 1 – 計數(shù)器使能 0 – 計數(shù)器禁止 TEN TSWAI TSFRZ TFFCA TSCR1 定時器控制寄存器 RST: 0 0 0 0 0 0 0 0 TCNT CLK . TEN B0.......……...B7 B8……..........B15 R = Reserved $0006 Address Offset $0004, 05 $FFFE $FFFF $0000 ******* ****** ** **** TOF 模塊時鐘 計數(shù)器寄存器 脈沖累加器 計時器溢出時，對溢出標(biāo)志位置位，如允許中斷，則向 CPU發(fā)出中斷請求 TM Freescale Semiconductor Confidential and Proprietary Information. Freescale? and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. 169。Freescale Semiconductor Confidential and Proprietary Information. Freescale? and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. 169。 Freescale Semiconductor, Inc. 2022. Slide 2 ECT 模塊結(jié)構(gòu) ? 一個 16位向上帶可編程預(yù)分頻的主計數(shù)器 . ?一個 16位的帶可編程預(yù)分頻的模數(shù)向下計數(shù)器 ?8個獨立的定時器通道，每個通道具備輸入捕捉和輸出比較功能 ?4個 8位脈沖累加器，也可設(shè)置成 2個 16位脈沖累加器 . ? 通過對寄存器編程可以實現(xiàn)不同的功能 TM Freescale Semiconductor Confidential and Proprietary Information. Freescale? and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. 169。 //prescale factor is 8, bus clock/128=8Mhz/8 TSCR2_TOI = 1。 Freescale Semiconductor, Inc. 2022. Slide 6 輸出比較功能 16位自由運行計數(shù)器 16位輸出比較寄存器 比如： 0x5678 軟件可以修改 引腳控制邏輯 中斷請求 OCxF 狀態(tài)標(biāo)志位置位， 當(dāng)比較發(fā)生時（值相等時） OCxI 中斷屏蔽 (通過軟件使能 ) ? 共有 8個輸出比較通道 ? 每個通道有自己的向量表和控制寄存器 ? 在特定的時刻輸出一個信號 當(dāng)比較寄存器的值和計數(shù) 器的值相等時，采取行動 比如：當(dāng) TCNT=0x5678 TCNT TOCx Pin OCx 比較 比較器 相等 置位 OR OR 清零 翻轉(zhuǎn) TM Freescale Semiconductor Confidential and Proprietary Information. Freescale? and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. 169。 Freescale Semiconductor, Inc. 2022. Slide 10 輸出比較 7 (2 of 2) C7I C6F C5F C4F C3F C2F C1F C0F OC7M7 OC7M6 OC7M5 OC7M4 OC7M3 OC7M2 OC7M1 OC7M0 4. TIE – 定時器中斷允許使能 5. OC7M OC7MASK B7.............................................................................................B0 1 TC7 16 位比較寄存器 7. RST: 0 0 0 0 0 0 0 0 RST: 0 0 0 0 0 0 0 0 $0002 $000C C7F C6F C5F C4F C3F C2F C1F C0F RST: 0 0 0 0 0 0 0 0 $000E B7.............................................................................................B0 2. TCNT 16位計數(shù)器 B15...............................................................................................................................................................B0 RST: 0..................................................................................................................................................0 $0004, $05 B7.............................................................................................B0 3. TFLG1 – 標(biāo)志位 OC7D7 OC7D6 OC7D5 OC7D4 OC7D3 OC7D2 OC7D1 OC7D0 6. OC7D OC7DATA RST: 0