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ZBasic System Library 166 ZX Microcontroller Family Serial Timer by Device ZX Model Serial Timer ZX-24, ZX40, ZX-44, ZX-24e Timer2 ZX-24a, ZX40a, ZX-44a, ZX-24ae, ZX-24ne, ZX-24pe, ZX-24nu, ZX-24pu Timer2 ZX-24p, ZX40p, ZX-44p, ZX-24n, ZX-40n, ZX-44n Timer2 ZX-24r, ZX40r, ZX-44r, ZX-24s, ZX-40s, ZX-44s Timer2 ZX-328n, ZX-328l, ZX-32n, ZX-32l, ZX-328nu Timer2 ZX-1281, ZX-1281n, ZX-1280, ZX-1280n, ZX-1281e, ZX-1281ne Timer0 ZX-24x, ZX-32a4, ZX-128a1 TimerD1 ZX-128e, ZX-128ne Timer2 For native code devices, the table below indicates which ISRs may be loaded by using OpenCom() in your program. If the compiler cannot determine which specific channel is being opened, all of the listed ISRs will be included. ISRs Required Underlying CPU Com Channel ISR Name mega644P, mega1284P Com1 Com2 Com3-Com6 USART0_RX, USART0_TX, USART0_UDRE USART1_RX, USART1_TX, USART1_UDRE Timer2_CompA mega328P Com1 Com3-Com6 USART0_RX, USART0_TX, USART0_UDRE Timer2_CompA mega128 Com1 Com2 Com3-Com6 USART0_RX, USART0_TX, USART0_UDRE USART1_RX, USART1_TX, USART1_UDRE Timer2_CompA mega1281 Com1 Com2 Com3-Com6 USART1_RX, USART1_TX, USART1_UDRE USART0_RX, USART0_TX, USART0_UDRE Timer0_CompA mega1280 Com1 Com2 Com3-Com6 Com7 Com8 USART0_RX, USART0_TX, USART0_UDRE USART1_RX, USART1_TX, USART1_UDRE Timer0_CompA USART2_RX, USART2_TX, USART2_UDRE USART3_RX, USART3_TX, USART3_UDRE xmega32A4 Com1 Com2 Com3-Com6 Com7 Com8 Com9 USARTD0_RXC, USARTD0_TXC, USARTD0_DRE USARTD1_RXC, USARTD1_TXC, USARTD1_DRE TimerD1_CCA USARTC0_RXC, USARTC0_TXC, USARTD0_DRE USARTC1_RXC, USARTC1_TXC, USARTD1_DRE USARTE0_RXC, USARTE0_TXC, USARTE0_DRE xmega128A1 Com1 Com2 Com3-Com6 Com7 Com8 Com9 Com10 Com11 Com12 USARTD0_RXC, USARTD0_TXC, USARTD0_DRE USARTD1_RXC, USARTD1_TXC, USARTD1_DRE TimerD1_CCA USARTC0_RXC, USARTC0_TXC, USARTD0_DRE USARTC1_RXC, USARTC1_TXC, USARTD1_DRE USARTE0_RXC, USARTE0_TXC, USARTE0_DRE USARTE1_RXC, USARTE1_TXC, USARTE1_DRE USARTF0_RXC, USARTF0_TXC, USARTF0_DRE USARTF1_RXC, USARTF1_TXC, USARTF1_DRE Note, particularly, that the ISRs for Com1 are always included in every program even if OpenCom() is not explicitly invoked.