45181 Parallax Inc, 45181 Datasheet - Page 68

• Manufacturer Part Number: 45181
• Description: SX TECH TOOL KIT NO POWER
• Manufacturer: Parallax Inc
• Series: SXr
• Type: Microcontrollerr

Specifications of 45181

• Contents: SX Book, SX Key, SX Tech Board, Samples, Resonators, Cable and Manual
• Product: Microcontroller Basic Stamps
• Operating Supply Voltage: 5 V
• For Use With/related Products: SX MCUs
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7 The SASM Assembler
When this macro is used in a program to be run on an SX48/52, it is necessary that the symbol SX48_52
is defined prior to the first invocation of the _bank macro.
7.4.13 Macros with Formal Parameters by Name
This is an example for a macro with one named parameter:
When invoked with
the word “cycles” is replaced by 7 and the macro expands into
The macro operates by generating as many JMP $+1 instructions as possible to use the bulk of the delay
at a cost of one instruction word per three clock cycles then make up the balance with NOP instructions.
For example, delay 6 would not generate NOP instructions at all but just two jmp $+1 instructions,
where delay 8 would generate two jmp $+1 and two NOP instructions. In case of cycles = 0, no code is
generated at all.
7.5
Symbols are descriptive names for numeric values. Symbol names can consist of up to 32 alphanumeric
and underscore (_) characters and must start with a letter or underscore. SASM expects symbol
declarations to start in column 1 of the program line. Symbols for constants are usually defined near the
start of assembly source code using the equal directive EQU. For example:
Page 68 SX-Key/Blitz Development System Manual 2.0 Parallax, Inc.
Symbols
delay MACRO cycles
ENDM
delay 7
IF (7 > 0)
ENDIF
REPT (7/3)
ENDR
REPT (7//3)
ENDR
IF (cycles > 0)
ENDIF
jmp $+1
jmp $+1
nop
REPT (cycles/3)
ENDR
REPT (cycles//3)
ENDR
jmp $+1
nop
; delay 3 cycles
; delay 1 cycle
; delay 3 cycles
; delay 3 cycles
; delay 1 cycle