45181 Parallax Inc, 45181 Datasheet - Page 156

• 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

15 Appendix E: SX Data Sheet
Special function and general-purpose register addresses $00 - $0F are ‘global’ in that they can always be
accessed regardless of the contents of the FSR. Special function register $07 (RC) is available as general
purpose RAM in 20-pin SX packages. Special function registers $08 (RD) and $09 (RE) are available as
general-purpose RAM in 20 and 28-pin SX packages.
15.2.10 Direct Addressing
Global registers can be directly accessed at any time but general-purpose registers can only be directly
accessed within the current bank. The global registers are numbered $01 through $0F. Figure 25 –
Global Register Addressing SX 20/28/48/52 (direct) shows how the Global Registers are addressed in
the SX20/28 and the SX48/52. Simply specify the desired global register address in the fr operand (the
register address operand) of instructions as shown below:
Page 156 SX-Key/Blitz Development System Manual 2.0 Parallax, Inc.
mov
*n is 7 on the SX20/28. n is 15 on the SX48/52
$01 - $0F
$00-
$01-
$02-
$0F-
Figure 25 - Global Register Addressing SX20/28/48/52 (direct)
$0F, #$55
Global
RTCC
IND
$0F
PC
$10-
$11-
$12-
$1F-
; move $55 to global register $0F
4
fr (5-bit address in instruction)
Bank 0
Register Selection Bits
$0
$1
$2
$F
3
Bank 1
2
$0
$1
$2
$F
—
—
Bank 2
1
$F
$0
$1
$2
0
———
Bank n*
$F
$0
$1
$2