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authorDimitri Sokolyuk <demon@dim13.org>2017-08-19 12:15:28 +0200
committerDimitri Sokolyuk <demon@dim13.org>2017-08-19 12:15:28 +0200
commit67d25d837ac55f28a366c0a3b262e439a6e75fc3 (patch)
treedf7715c7724c5935ab87c807f3b8b4ef529315e3 /amforth-6.5/msp430/devices/msp430g2553/words/cold.asm
parente0d6784e89dba33226c0edb815bb974486fa7c48 (diff)
Add AmForth
Diffstat (limited to 'amforth-6.5/msp430/devices/msp430g2553/words/cold.asm')
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diff --git a/amforth-6.5/msp430/devices/msp430g2553/words/cold.asm b/amforth-6.5/msp430/devices/msp430g2553/words/cold.asm
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+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