ZBasicSysLib - page 24 of 361

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ZBasic System Library

ZBasic Microcontrollers

mega329PA, mega649, mega649A, mega649P

mega3250, mega3250P,

mega6450, mega6450A, mega6450P,

mega3290, mega3290P,

mega6490, mega6490A, mega6490P

mega1281, mega2561

mega64, mega64A, mega128, mega128A

mega640, mega1280, mega2560

mega8U2, mega16U2, mega32U2,

AT90USB82, AT90USB162

mega16U4, mega32U4

AT90CAN32, AT90CAN64, AT90CAN128,

AT90USB646, AT90USB647, AT90USB1286,

xmegaA1, xmegaA1U

TimerF1 TimerD1

TimerC0 TimerC0

TimerD0 TimerD0

TimerD1 TimerD1

xmegaA3, xmegaA3U,

xmegaA3B, xmegaA3BU

TimerE1 TimerD1

TimerC0 TimerC0

TimerD0 TimerD0

TimerD1 TimerD1

xmegaA4, xmegaA4U

TimerE0 TimerD1

TimerC0 TimerC0

TimerD0 TimerD0

TimerD1 TimerD1

TimerF0 TimerD0

TimerC0 TimerC0

TimerD0 TimerD0

TimerE0 TimerD0

TimerC0 TimerC0

TimerD0 TimerD0

When used, the RTC Timer is configured to generate an interrupt that is used to update the RTC and to

trigger task switching. Because its role is so central, the RTC Timer (if enabled) cannot be used for any

other purpose. The I/O Timer is used by several I/O related routines as explained in more detail below.

The Serial Timer is used to generate interrupts to implement the timing required for serial channels Com3

to Com6. If none of the channels 3-6 are open, the Serial Port Timer can be used for other purposes in

your program. Timers are also used for some specialized I/O functions as indicated in the table above.

On ATtiny and ATmega targets, the Serial timer is also used for 8-bit PWM generation. Consequently,

use of 8-bit PWM and use of Com3 to Com6 are mutually exclusive. On some target devices, the same

timer is indicated for both the RTC and the Serial/8-bit PWM functions. For these devices, the application

can employ the RTC or the Serial/8-bit PWM functions but not both.

For each timer, there exists a built-in variable that indicates when the timer is in use. For example,

Register.Timer0Busy and Register.TimerC1Busy are Boolean values that indicate when Timer0