668-0003-C Rabbit Semiconductor, 668-0003-C Datasheet - Page 38
668-0003-C
Manufacturer Part Number
668-0003-C
Description
IC CPU RABBIT2000 30MHZ 100PQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0003.pdf
(228 pages)
Specifications of 668-0003-C
Rohs Status
RoHS non-compliant
Processor Type
Rabbit 2000 8-Bit
Speed
30MHz
Voltage
2.7V, 3V, 3.3V, 5V
Mounting Type
Surface Mount
Package / Case
100-MQFP, 100-PQFP
Features
-
Other names
316-1004
668-0003
668-0003
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
668-0003-C
Manufacturer:
Rabbit Semiconductor
Quantity:
10 000
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3.4.4 Comparisons of Integers
Unsigned integers may be compared by testing the zero and carry flags after a subtract
operation. The zero flag is set if the numbers are equal. With the SBC instruction the carry
cleared is set if the number subtracted is less than or equal to the number it is subtracted
from. 8-bit unsigned integers span the range 0–255. 16-bit unsigned integers span the
range 0–65535.
If A is in HL and B is in DE these operations can be performed as follows assuming that
the object is to set HL to 1 or 0 depending on whether the compare is true or false.
32
OR a
SBC HL,DE
A>=B
A<B
A==B
A>B
A<=B
; compute HL<DE
; unsigned integers
; EX DE,HL
OR a
SBC HL,DE
SBC HL,HL
BOOL HL
;unsigned integers
; compute HL>=DE or DE>=HL - check for !C
; EX DE,HL
OR a
SBC HL,DE
SBC HL,HL
INC HL
; 0 if C , 1 if !C
;
: compute HL==DE
OR a
SBC HL,DE
BOOL HL
DEC HL
BOOL HL
;
!C
C
Z
!C & !Z
C v Z
; clear carry
; zero is equal
; force to zero, 1
; invert logic
; 12 clocks total -logical not, 1 for inputs equal
; uncomment for DE<HL
; clear carry
; C set if HL<DE
; HL-HL-C --
; set to 1 if carry, else zero
; else result == 0
; uncomment for DE<=HL
; clear carry
; !C if HL>=DE
; HL-HL-C - zero if no carry, -1 if C
; 14 / 16 clocks total -if C after first SBC result 1,
; else 0
; clear carry
; HL=A and DE=B
-1 if carry set
Rabbit 2000 Microprocessor User’s Manual
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