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s6-up-tp/TP4/TP40.txt
2017-06-09 12:30:34 +02:00

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; lecture de la liaison série
.equ RAMEND = 0x21FF
.equ SPH = 0x3E
.equ SPL = 0x3D
.equ UBRR0H = 0x00C5
.equ UBRR0L = 0x00C4
.equ UCSR0A = 0x00C0
.equ UCSR0B = 0x00C1
.equ UCSR0C = 0x00C2
.equ UDR0 = 0x00C6
.org 0x0000
; Vecteur RESET
jmp debut
.org 0x0080
debut:
; initialisation du pointeur de pile
ldi r28,low(RAMEND)
ldi r29,high(RAMEND)
out SPL, r28
out SPH, r29
UBRR0H <- 3
UBRR0L <- 64
UCSR0A <- 0b00000110
UCSR0B <- 0b00011000
UCSR0C <- 0b00000110
boucle:
; attend qu'un caractère arrive
si (UCSR0a & 0x80) == 0 saut boucle
R20 <- UDR0
si R20 == 'a' alors R20 <- 'A'
si R20 == 'e' alors R20 <- 'E'
UDR0 <- R20
saut boucle