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