ZBasicSysLib - page 23 of 361

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ZBasic System Library

ZBasic Microcontrollers

ISRs Required for Serial Channels

tiny87, tiny167

tiny2313, tiny2313A,

tiny4313, tiny828, tiny441,

tiny841, tiny1634

USART#_RX, USART#_TX, USART#_UDRE

all other ATtiny

Com1, Com2, Com7, Com8

USART#_RX, USART#_TX, USART#_UDRE

Com1, Com2, Com7-Com12

USART#_RXC, USART#_TXC, USART#_DRE

Note, particularly, that if the console (typically Com1) is implicitly opened for an application, the ISRs for

the console channel will be included in the application even if OpenCom() is not explicitly invoked. The

console channel is implicitly opened by default for all ZX devices but not so for generic target devices.

ZBasic devices generally have multiple timers, depending on the underlying CPU type, that are used for

various purposes. One of the timers is (optionally) used to implement the real time clock (RTC), another

is used for the software-based serial ports and a third timer is used to provide the precise timing required

for certain I/O routines. The specific timer that is used for a particular function varies depending on the

underlying CPU type as shown in the table below.

Timer Usage by Target Device

tiny24, tiny24A, tiny44, tiny44A, tiny84, tiny84A

tiny87, tiny167, tiny2313, tiny2313A, tiny4313,

tiny828, tiny1634

tiny441, tiny841

mega48, mega48A, mega48P, mega48PA,

mega48PB, mega88, mega88A, mega88P,

mega88PA, mega88PB, mega168, mega168A,

mega168P, mega168PA, mega168PB,

mega328, mega328P, mega328PB

mega16, mega16A, mega164A, mega164P,

mega164PA, mega32, mega32A, mega324P,

mega324PA, mega644, mega644A,

mega644P, mega644PA, mega8535

mega165, mega165A, mega165P,

mega165PA, mega325, mega325P,

mega645, mega645A, mega645P,

mega169, mega169A, mega169P,

mega169PA, mega329, mega329P,