rjmp
rcall
ret
reti
ijmp
icall
push
pop
ZH
ZL
HIGH (RAMEND)
LOW (RAMEND)
RAMEND
SPH
SPL
AT90S4433
.include "4433def.inc"
ldi r16, RAMEND
out SP, r16
Atmega8:
.include "m8def.inc"
ldi r16, HIGH (RAMEND)
out SPH, r16
ldi r16, LOW (RAMEND)
out SPL, r16
256 RAM - Attiny 90S4433
HD44780
KS0070
KS0066U
SED1278
TC1602E
ANAG VISION AV1623-YFTY
pollin 120420
pollin 121714
PORTD
DDRD
DB7 .. DB0
ldi r16, 0xff
out DDRD, r16
VCC, VDD, VEE, VSS, VPP
VCC: Voltage, Current, Collector
VSS: GND - Pin 1 - eckig
1. Pin: VSS
2. Pin: VDD
3. Pin: VEE
4. Pin: RS
5. Pin: RW
6. Pin: E
7. bis 14. Pin: DB0 .. DB7
15. Pin: A
16. Pin: K
1. Pin: VSS: GND
2. Pin: VDD: +5V - VCC - Versorgungsspannung
3. Pin: VEE: -5V/0V - 5V: Kontrastspannung
4. Pin: RS: Register Select
5. Pin: RW: Read/Write
6. Pin: E: Enable/Disable
7. bis 14. Pin: DB0 .. DB7
15. Pin: A
16. Pin: K
4. Pin: RS: Register Select
0 = Befehl
1 = Daten
5. Pin: RW: Read/write
0 = Write
1 = Read
4-Modus
8-Modus
Im Vier Bit
DB7 .. DB4 sind verbunden
Bei der "Ubertragung
1.) H"ohere Vier Bit
2.) Niederwertiges Nibble
DB7: PD3
DB6: PD2
DB5: PD1
DB4: PD0
$3, $3, $3
$3, $3, $3, $2
$3, $3, $3, $2, $20
Im Vier Bit Modus
swap r16
aus 0b01010010 wird
0b00100101
Vier Bit Modus
ldi r17, r16
swap r16
andi r16, 0b00001111
out PORTD, r16
andi r17, 0b00001111
out PORTD, r16
Warten, mit Enable
sbr PORTD, 5
nop
nop
nop
cbr PORTD, 5
Befehle
1.) Clear Display
2.) Cursor Home
3.) Entry Mode
4.) On/Off Controll
5.) Cursor/Scrollen
6.) Konfiguration
7.) Charakter RAM Address Set
8.) Display RAM Address Set
0b0000 0001 - Clear Display
0b0000 001x - Cursor Home
0b0000 01is - Entry Mode
0b0000 1dcb - On/Off Controll
0b0001 srxx - Cursor/Scrollen
0b....
0b01aa aaaa - Character RAM Address Set
0b1aaa aaaa - Display RAM Address Set
UBRR
UBRRL, UBRRH
UDR
UCSRA, UCSRB, UCSRC
TXEN
TXE
UCS..0 und 1
USEL oder so
UART - Asynchronous Reciever/Transmitter
MAX232 - Pegelwandler
R1IN
R2IN
T1IN
T2IN
R1OUT
R2OUT
T1OUT
T2OUT
Baud-Rate: 1 Zeichen Pro Sekunde = 1 Baud
Jean Maurice Emile Baudot
Baudot Code - urspr"unglicher synchroner 5 Bit - Digitaler Code - CCITT-1
TxD, RxD
RTS, CTS
DSR,
Terminal = PC = Datenendger"at
Modem = Daten"ubertragungsger"at
NUL
SOH - Start of Heading
STX - Start of Text
ETX - End of Text
EOT - End of Transmission
ETB - End of Transmission Block
ACK - Acknowledge
NAK - Negative Acknowlege
VT - Vertical Tab
HT - Horizontal Tab
LF - Line Feed
FF - Form Feed
CR - Carriage Return
DEL - Delete
CAN - Cancel
SO - Shift Out
SI - shift In
DC1, ..., DC4: Device Controll
Strg-Q, Strg-S
ACK/NAK-Protokoll
X-ON/X-OFF Protokoll
Problem: Asynchron, kein Takt - Data Flow Controll
1.) Protokoll
2.) Hardware
3.) Software
brid, brie
brcc, brcs
brhs, brhc
brbs, brbc
brvs, brvc
brts, brtc
breq, brne
brlt, brge
brmi, brpl
brsh, br
...
X, Y, Z
-X, X, X+
-Y, Y, Y+
-Z, Z, Y+
ld, ldd, ldi, lds
st, std, sts
lpm spm
ld r0, -X
ld r0, X
ld r0, X+
ld r0, -Y
ld r0, Y
ld r0, Y+
ld r0, -Z
ld r0, Z
ld r0, Z+
st -X, r0
st X, r0
st X+, r0
st -Y, r0
st Y, r0
st Y+, r0
st -Z, r0
st Z, r0
st Z+, r0
ldd r0, Y+k
ldd r0, Z+k
std Y+k, r0
std Z+k, r0
add
adc
adiw
sub
sbc
sbiw
subi
sbci
add Add two registers
adc Add with carry two registers
adiw Add immidiate to Word
sub Subtract two registers
sbc Subtract with carry two registers
sbiw Subtract immediate from word
subi Subtract constant from register
sbci Subtract with carry constant from register
Minix - gleich lernen, was ich weiss:
NR_REGS
NR_SEGS
NR_HOLES
NR_PROCS
NR_TASKS
struct mem_map {
vir_clicks mem_vir;
phys_clicks mem_phys;
vir_clicks mem_len;
};
vir, phys, len
mem_map, ...
EXTERN struct proc {
int p_reg [N_REGS];
} proc [NR_TASKS + NR_PROCS];
PRIVATE struct hole {
phys_clicks h_base;
phys_clicks h_len;
struct hole *h_next;
};
vir, phys, bytes, clicks
vir_bytes
vir_clicks
phys_bytes
phys_clicks
h/const.h
h/com.h
h/callnr.h
h/sgtty.h
h/stat.h
h/signal.h
h/type.h
h/error.h
h, kernel, mm, fs
kernel/...h
kernel/main.c
kernel/proc.c
kernel/system.c
kernel/mpx88.s
kernel/klib88.s
kernel/clock.c
kernel/memory.c
kernel/tty.c
kernel/floppy.c
kernel... winni oder disk
kernel/main.c
main ()
unexpected_int ()
trap ()
div_trap ()
set_vec ()
panic ()
kernel/mpx88.s
_MINIX:
_s_call:
_wini_int:
_clock_init
_tty/floppy...
_trp:
_divide:
_suprise:
_save:
_restart:
_idle:
_data:
kernel/floppy:
tty_task ()
do_rdwt ()
start_motor ()
stop_motor ()
clock_mess ()
send_mess ()
seek ()
transfer ()
recalibrate ()
reset ()
fdc_results ()
fdc_out ()
kernel/tty.c
tty_task ()
do_read
do_write
do_ioctl
do_cancel
do_charint
keyboard
console
set_6845
beep
escape
flush
scroll_screen
char_in ?
char_out ?
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