CODEHEADER(XT_COLD,4,"cold") main: ; Debugger requires the 'main' symbol. reset: ; Watchdog Timer MOV #(WDTPW+WDTHOLD),&WDTCTL ; stop watchdog timer ; Basic Clock Module ; My thanks to the 4e4th team for the following two lines! MOV.B &CALBC1_8MHZ, &BCSCTL1 ; Set DCO MOV.B &CALDCO_8MHZ, &DCOCTL ; to 8 MHz. MOV.B #00h,&BCSCTL2 ; MCLK=DCO/1, SMCLK=DCO/1 ; Flash Memory Controller ; Flash Timing Generator frequency must be 257-476 kHz. ; 8 MHZ/17 = 470.59 kHz. tFTG=2.125 msec. ; At 470 kHz, byte/word program time is 35*tFTG = 75 usec. ; Cumulative program time to any 64-byte block (between erasures) ; must not exceed 4 msec, thus 53 writes at 250 kHz. Therefore, ; do not use exclusively byte writes in a 64-byte block. ; Also, "a flash word (low + high byte) must not ; be written more than twice between erasures." ; Program/Erase endurance is 10,000 cycles minimum. MOV #FWKEY+0,&FCTL1 ; write & erase modes OFF MOV #FWKEY+FSSEL1+16,&FCTL2 ; SMCLK/17 = 471 kHz. MOV #FWKEY+LOCK,&FCTL3 ; lock flash memory against writing ; Interrupt Enables MOV.B #0,&IE1 ; no interrupts enabled MOV.B #0,&IE2 ; no interrupts enabled ; Forth registers MOV #RSTACK,SP ; set up stack MOV #PSTACK,PSP MOV #UAREA,UP ; initial user pointer CLR R15 ; now hand over to Forth with WARM (a colon word) MOV #XT_WARM+2,IP NEXT