20081022fabl.txt

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REGISTERS
SEE tiny44.pdf:7
NOTE I have taken the register address not in parentheses
PORTA register address: 0x1B
DDRA  register address: 0x1A
PINA  register address: 0x19

SEE tiny44.pdf:9
sbi   A,b  - set bit in i/o register  BIT AND BIT TEST
cbi   A,b  - clear bit in i/o register BIT AND BIT TEST
ldi   Rd,K - load immediate DATA TRANSFER
out   A,Rr - out port DATA TRANSFER
sbis  A,b  - skip if bit in register is set asm:101,108
lsr   Rd   - logical shift right
dec   Rd   - decrement, subtracts one
brne  k    - branch if not equal
brcc  k    - branch if carry cleared
rjmp  k    - relative jump, to address within +/i 2*k
nop        - no operation (increments program counter)
rcall k    - relative call to subroutine
lpm   Rd,Z - load program memory
mov   Rd,Rr- copy register
cpi   Rd,k - compare with immediate
breq  k    - branch if equal (conditional relative branch)
adiw  Rd+1:Rd,K - adds an immediate value to a register pair
ret        - return from subroutine

NOTE
looks like P (tiny44.pdf:7) is A (avr.pdf:1)

OPERAND ABBREVIATIONS
SEE avr_instruction_set.pdf:1
Rd  Destination (and source) register in the Register File (ex R15)
Rr  Source register in the Register File
Rdl maybe refers to Rd with l flag:global interrupt enable/disable
K   constant data
A   I/O location address
P - (no mention) [asm:83 a register]
k   constant address
b - bit in the Register File or I/O Register (3-bit)[asm:83 a pin]
s - bit in the Status Register (3-bit)

so: are pins "bits in the register file"?

where can I find definitions of
.equ
.def
.macro, .endmacro
.include
.cseg
.org

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Knuth, vol. 2, p. 231
ones' complement is arithmetic modulo 2^n - 1
two's complement is arithmetic modulo 2^n


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lines30:31
what are zl, zh?