668-0003-C Rabbit Semiconductor, 668-0003-C Datasheet - Page 37

• Manufacturer Part Number: 668-0003-C
• Description: IC CPU RABBIT2000 30MHZ 100PQFP
• Manufacturer: Rabbit Semiconductor

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

3.4 How to Do It in Assembly Language—Tips and Tricks
3.4.1 Zero HL in 4 Clocks
This sequence requires four clocks compared to six clocks for
3.4.2 Exchanges Not Directly Implemented
HL<->HL' - eight clocks
DE<->DE' - six clocks
BC<->BC' - 12 clocks
Move between IX, IY and DE, DE'
IX/IY->DE / DE->IX/IY
3.4.3 Manipulation of Boolean Variables
Logical operations involving HL when HL is a logical variable with a value of 1 or 0—
this is important for the C language where the least bit of a 16-bit integer is used to repre-
sent a logical result
Logical
clocks)
Logical
Chapter 3 Details on Rabbit Microprocessor Features
BOOL HL
RR HL
EX DE',HL
EX DE',HL'
EX DE',HL
EX DE',HL
EX DE,HL
EX DE',HL
EX DE',HL
EX DE,HL'
EX DE,HL
EXX
EX DE,HL
;IX, IX --> DE
EX DE,HL
LD HL,IX/IY
EX DE,HL
EX DE,HL
LD IX/IY,HL
EX DE,HL
DEC HL
BOOL HL
ADD HL,DE
RES 1,l
not
xor
operator—invert bit 0 of HL in four clocks (also works for
operator—
; 2 clocks, clears carry, HL is 1 or 0
; 2 clocks, 4 total - get rid of possible 1
; 1 goes to zero, zero goes to -1
; -1 to 1, zero to zero. 4 clocks total
; 2 clocks
; 2 clocks
; 2 clocks, 6 total
; 2 clocks
; 4
; 2
; 2
; 2
; 2 clocks
; 4 clocks
; 2 clocks, 8 total
/ LD IX/IY,HL
; 6 clocks total, clear bit 1 result of
; 8 clocks total
; DE --> IX/ IY
; 8 clocks total
xor HL,DE
when HL/DE are 1 or 0.
LD HL,0
if 1+1=2
.
IX
,
IY
in eight
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