45111 Datasheet, PDF (152/184 Pages) List of Unclassifed Manufacturers – 14-DAY MONEY BACK GUARANTEE

15 Appendix E: SX Data Sheet
– SX48/52 Register Map demonstrate the structure of the registers for the SX20/28 and the SX48/52,
respectively. In all SX instructions, bit 4 of the register address operand determines whether the global
registers are accessed or whether a bank of general-purpose registers is accessed.
Figure 21 - SX20/28 Register Map
SX20/28 Register Map
Global
Bank 0 Bank 1 Bank 2
$00- IND
$10- $0
$0
$0
$01- RTCC
$11- $1
$1
$1
$02- PC
$12- $2
$2
$2
$03- Status
$13- $3
$3
$3
$04- FSR
$14- $4
$4
$4
$05- Port A
$15- $5
$5
$5
$06- Port B
$16- $6
$6
$6
$07- Port C*
$17- $7
$7
$7
———
$08- $08
$18- $8
$8
$8
$09- $09
$19- $9
$9
$9
$0A- $0A
$1A- $A
$A
$A
$0B- $0B
$1B- $B
$B
$B
$0C- $0C
$1C- $C
$C
$C
$0D- $0D
$1D- $D
$D
$D
$0E- $0E
$1E- $E
$E
$E
$0F- $0F
$1F- $F
$F
$F
*Port C is available as general-purpose RAM in the SX20.
Figure 22 - SX48/52 Register Map
SX48/52 Register Map
Global
Bank 0* Bank 1 Bank 2
$00- IND
$10- $0
$0
$0
$01- RTCC
$11- $1
$1
$1
$02- PC
$12- $2
$2
$2
$03- Status
$13- $3
$3
$3
$04- FSR
$14- $4
$4
$4
$05- Port A
$15- $5
$5
$5
$06- Port B
$16- $6
$6
$6
$07- Port C
$17- $7
$7
$7
———
$08- Port D
$18- $8
$8
$8
$09- Port E
$19- $9
$9
$9
$0A- $0A
$1A- $A
$A
$A
$0B- $0B
$1B- $B
$B
$B
$0C- $0C
$1C- $C
$C
$C
$0D- $0D
$1D- $D
$D
$D
$0E- $0E
$1E- $E
$E
$E
$0F- $0F
$1F- $F
$F
$F
* Bank 0 is available only when using semi-direct addressing.
Bank 7
$0
$1
$2
$3
$4
$5
$6
$7
$8
$9
$A
$B
$C
$D
$E
$F
Bank 15
$0
$1
$2
$3
$4
$5
$6
$7
$8
$9
$A
$B
$C
$D
$E
$F
Page 152 • SX-Key/Blitz Development System Manual 2.0 • Parallax, Inc.