mcu_cfg.inc

#ifndef _MCU_CFG_INC_
#define _MCU_CFG_INC_
;------------------------------------------------------------------
;	MCU CONFIG
;------------------------------------------------------------------
.EQU	DRV_PIN				=	PINB0
.EQU	START_PIN			=	PINB1
.EQU	LED_PIN				=	PINB2
.EQU	STOP_PIN			=	PINB3

.EQU	PORTB_DIR_CFG		=	(1<<LED_PIN)|(1<<DRV_PIN)|(0<<START_PIN)|(0<<STOP_PIN)
.EQU	PORTB_DAT_CFG		=	(1<<LED_PIN)|(1<<DRV_PIN)|(1<<START_PIN)|(1<<STOP_PIN)

;------------------------------------------------------------------

#endif

useful_macro_tn12.asm
#ifndef _USEFUL_MACROS_ASM_
#define _USEFUL_MACROS_ASM_

.macro	outi
; Writes a 8-bit immediate value to an 8-bit i/o SFR.
; Usage: outi IOREG8,value.
; Uses/trashes a tmp register for operation.
	ldi	tmp,@1
	out	@0,tmp
.endm

#endif

main.asm
;=====================================================================
.DEVICE				ATtiny12
;---------------------------------------------------------------------
.INCLUDE			"tn12def.inc"
.INCLUDE			"mcu_cfg.inc"
.INCLUDE			"useful_macro_tn12.asm"

	outi	DDRB,PORTB_DIR_CFG
	outi	PORTB,PORTB_DAT_CFG