Page 46 of 346 Start Back Next End ZBasic System Library 34 ZBasic Microcontrollers The table below shows the register containing the Analog Comparator Multiplexer Enable (ACME) bit. Where available, this bit can be used to allow the output of the analog input multiplexer to feed the negative input of the analog comparator. For target devices having n/a in the second column, this capaability is not present. Register Containing the ACME Bit by Target Device Target Device ACME bit Register tiny24, tiny24A, tiny44, tiny44A, tiny84, tiny48, tiny88, tiny87, tiny167 ADCSRB tiny2313, tiny2313A, tiny4313 n/a mega8, mega8A, mega16, mega16A, mega32, mega32A, mega163, mega323, mega8535 SFIOR mega48, mega48A, mega48P, mega48PA, mega88, mega88A, mega88P, mega88PA, mega168, mega168A, mega168P, mega168PA, mega328, mega328P ADCSRB mega8515, mega161, mega162 n/a mega164A, mega164P, mega164PA, mega324P, mega324PA, mega644, mega644A, mega644P, mega644PA, mega1284P ADCSRB mega165, mega165A, mega165P, mega165PA, mega325, mega325P, mega645, mega645A, mega645P, mega169, mega169A, mega169P, mega169PA, mega329, mega329P, mega329PA, mega649, mega649A, mega649P ADCSRB mega3250, mega3250P, mega6450, mega6450A, mega6450P, mega3290, mega3290P, mega6490, mega6490A, mega6490P ADCSRB mega64, mega64A, mega128, mega128A, AT90CAN32, AT90CAN64, AT90CAN128 SFIOR mega1281, mega2561, mega640, mega1280, mega2560, mega16U4, mega32U4 ADCSRB mega8U2, mega16U2, mega32U2, AT90USB82, AT90USB162 n/a AT90USB646, AT90USB647, AT90USB1286, AT90USB1287 ADCSRB The table below shows the analog comparator input pins for ATxmega targets and ZX devices based on xmega chips. ATxmega Analog Comparator Interrupt Support Processors WaitForInterrupt intNum Interrupt Trigger Interrupt xmegaA1, xmegaA3, xmegaA3B, xmegaA4, xmegaD3, xmegaD4 waitAnalogCompA0 waitAnalogCompA1 waitAnalogCompAW AC A, Channel 0 AC A, Channel 1 AC A, Window ACA_AC0 ACA_AC1 ACA_ACW xmegaA1, xmegaA3, xmegaA3B waitAnalogCompB0 waitAnalogCompB1 waitAnalogCompBW AC B, Channel 0 AC B, Channel 1 AC B, Window ACB_AC0 ACB_AC1 ACB_ACW Interrupt Service Routines For the native code devices (e.g. ZX-24n), a few interrupt service routines (ISRs) are typically included in your program (e.g. for Com1 and the RTC if not specifically disabled) while others are included only if certain System Library routines are used in your program. In some cases, the additional ISRs that are included when a specific System Library routine is used depends on how the routine is invoked and what the compiler can deduce regarding which ISRs might be needed. For example, if OpenCom() is invoked one or more times but the compiler can determine that the Com1 is always the channel being used, no additional ISRs are included since the Com1 ISRs are usually included anyway. On the other hand, if the compiler cannot determine which channel is being opened in one or more cases, it includes the ISRs for all Com channels, both hardware-based and software-based channels. In the description of each System Library routine, information is given about the set of ISRs might be included in your program if you use that routine. This information is only important, of course, if you are also providing one or more ISRs in your code because conflicts may arise. (See the section entitled “Defining Interrupt Service Routines” in the ZBasic Language Reference Manual for more information on how this is done.) The table below gives an overview of which System Library routines may cause ISRs to be included atomatically in your program.