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README.md

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Summary

This template is meant as a basic starting point for ATtiny817 (ATtiny817-Xmini) projects written in assembler for low power applications.

Features:

  • Interrupt-Vector
.cseg
.org 0x00 ; RESET
	rjmp main

.org 0x02 ; NMI - Non-Maskable Interrupt from CRC
	rjmp int_catch
.org 0x04 ; VLM - Voltage Level Monitor
	rjmp int_catch
...
  • Automatic unlocking of protected io-registers
sconf CLKCTRL_MCLKCTRLA, CLKCTRL_CLKSEL_OSCULP32K_gc
  • Configuration of 32.768kHz oscillator
; +----------------------------------------------------------------------------+
; | Init Clock                                                                 |
; +----------------------------------------------------------------------------+
init_clock:
	; Enable ultra low power oscillator
	sconf CLKCTRL_MCLKCTRLA, CLKCTRL_CLKSEL_OSCULP32K_gc

_init_clock_wait_for_32kosc: ; Wait for clock to be stable
	lds reg_tmp0, CLKCTRL_MCLKSTATUS
	sbrs reg_tmp0, CLKCTRL_OSC32KS_bp
	rjmp _init_clock_wait_for_32kosc
	
	sconf CLKCTRL_MCLKCTRLB, 0x00 ; Disable divider
	sconf CLKCTRL_MCLKLOCK, CLKCTRL_LOCKEN_bm ; Lock clock config. register
	ret ; Return