20-668-0003 Rabbit Semiconductor, 20-668-0003 Datasheet - Page 39
20-668-0003
Manufacturer Part Number
20-668-0003
Description
IC CPU RABBIT2000 30MHZ 100PQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0003.pdf
(228 pages)
Specifications of 20-668-0003
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
Data Bus Width
8 bit
Maximum Clock Frequency
30 MHz
Operating Supply Voltage
0 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Number Of Programmable I/os
40
Number Of Timers
8 & 10 bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
20-668-0003
316-1062
316-1062
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
20-668-0003
Manufacturer:
Rabbit Semiconductor
Quantity:
10 000
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Some simplifications are possible if one of the unsigned numbers being compared is a
constant. Note that the carry has a reverse sense from
pseudo-code in the form
address pointed to by
the 16-bit unsigned integer
For signed integers the conventional method to look at the zero flag, the minus flag and
the overflow flag. Signed 8-bit integers span the range –128 to +127 (0x80 to 0x7F).
Signed 16-bit integers span the range –32768 to + 32767 (0x8000 to 0x7FFF). The sign
and zero flag tell which is the larger number after the subtraction unless the overflow is
set, in which case the sign flag needs to be inverted in the logic, that is, it is wrong.
Chapter 3 Details on Rabbit Microprocessor Features
;test for HL>B
LD DE,(65535-B)
ADD HL,DE
SBC HL,HL
BOOL HL
; HL>=B
LD DE,(65536-B)
ADD HL,DE
SBC HL,HL
BOOL HL
; HL>=B
LD HL,1
; HL<B B is a constant, not zero (if B==0 always false)
LD DE,(65536-B)
ADD HL,DE
SBC HL,HL
INC HL
;
; HL <= B B is constant not zero
LD DE,(65535-B)
ADD HL,DE
CCF
SBC HL,HL
INC HL
;
; HL <= B B is zero - true if HL==0
BOOL HL
;
; HL==B and B is a constant
LD DE,(65536-B)
ADD HL,DE
BOOL HL
INC HL
RES 1,l
; HL==B and B==0
BOOL HL
INC HL
RES 1,l
and B is zero
B is constant not zero
; carry set if HL>B
; HL-HL-C
; 14 total clocks - true if HL>B
; 14 clocks
; 6 clocks
; not carry if HL<B
; -1 if carry, else 0
; 14 clocks --0 if carry, else 1 if no carry
; ~C if HL<=B
; C if true
; if C -1 else 0
; 16 clocks -- 1 if true, else 0
; result in HL
; zero if equal
; 16 clocks
; 8 clocks
65535-B
B is constant
LD DE,(65535-B)
B
.
, but simply indicates the difference between 65535 and
- result -1 if carry set, else zero
not zero
does not indicate a load of
SBC
. In the following examples, the
DE
with the
33
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