diff options
Diffstat (limited to 'electronics/asm/mem.ba~')
| -rw-r--r-- | electronics/asm/mem.ba~ | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/electronics/asm/mem.ba~ b/electronics/asm/mem.ba~ new file mode 100644 index 0000000..62c8d54 --- /dev/null +++ b/electronics/asm/mem.ba~ @@ -0,0 +1,28 @@ +start:
+init:
+ clrf PORTA ; make sure port A output latches are low
+ clrf PORTB ; make sure port B output latches are low
+ bsf STATUS,RP0 ; select memory bank 1
+ movlw b'11111111' ; set port A data direction to inputs
+ movwf TRISA
+ movlw b'00000000' ; set port B data direction to outputs
+ movwf TRISB
+ bcf STATUS,RP0 ; select memory bank 0
+ goto main
+;; for this program use the 2k 8 bit mem chip, with WE on B2, OE on B3, and the memorys 3 least
+;; sig bits to B4-B6 (inclusive), all other pins on the mem chip need to be held low, and an led
+;; needs to be on B1
+;; when B1 goes high move the 3 pins from the microcontroler to leds and see the value
+main:
+ movlw b'01111000'
+ movwf PORTB ; make we high, oe low, and 3 pins high
+ call wait1000ms
+
+ movlw b'00000110'
+ movwf PORTB ; make we low, oe high, and 3 pins low
+
+noend:
+ goto noend
+
+ END ; ends the program
+
|