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AT89C51ID2 Datasheet(PDF) 42 Page - ATMEL Corporation |
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AT89C51ID2 Datasheet(HTML) 42 Page - ATMEL Corporation |
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42 / 157 page  42 AT89C51ID2 4289C–8051–11/05 Table 27. CMOD Register CMOD - PCA Counter Mode Register (D9h) Reset Value = 00XX X000b Not bit addressable The CMOD register includes three additional bits associated with the PCA (See Figure 14 and Table 27). • The CIDL bit which allows the PCA to stop during idle mode. • The WDTE bit which enables or disables the watchdog function on module 4. • The ECF bit which when set causes an interrupt and the PCA overflow flag CF (in the CCON SFR) to be set when the PCA timer overflows. The CCON register contains the run control bit for the PCA and the flags for the PCA timer (CF) and each module (Refer to Table 28). • Bit CR (CCON.6) must be set by software to run the PCA. The PCA is shut off by clearing this bit. • Bit CF: The CF bit (CCON.7) is set when the PCA counter overflows and an interrupt will be generated if the ECF bit in the CMOD register is set. The CF bit can only be cleared by software. 76 543 210 CIDL WDTE - - - CPS1 CPS0 ECF Bit Number Bit Mnemonic Description 7CIDL Counter Idle Control Cleared to program the PCA Counter to continue functioning during idle Mode. Set to program PCA to be gated off during idle. 6WDTE Watchdog Timer Enable Cleared to disable Watchdog Timer function on PCA Module 4. Set to enable Watchdog Timer function on PCA Module 4. 5- Reserved The value read from this bit is indeterminate. Do not set this bit. 4- Reserved The value read from this bit is indeterminate. Do not set this bit. 3- Reserved The value read from this bit is indeterminate. Do not set this bit. 2 CPS1 PCA Count Pulse Select CPS1 CPS0Selected PCA input 0 0 Internal clock fCLK PERIPH/6 0 1Internal clock fCLK PERIPH/2 1 0Timer 0 Overflow 1 1 External clock at ECI/P1.2 pin (max rate = fCLK PERIPH/ 4) 1 CPS0 0ECF PCA Enable Counter Overflow Interrupt Cleared to disable CF bit in CCON to inhibit an interrupt. Set to enable CF bit in CCON to generate an interrupt. |
Similar Part No. - AT89C51ID2_14 |
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Similar Description - AT89C51ID2_14 |
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