Register: Special Purpose Register array; provides indirect access to cog's special registers.

((PUB ┆ PRI))
SPR [Index]

Returns: Value in special purpose register at Index.

Index is an expression that specifies the index (0-15) of the special purpose register to access (PAR through VSCL).

Explanation

SPR is an array of the 16 special purpose registers in the cog. Element 0 is the PAR register and element 15 is the VSCL register. See the Cog RAM Special Purpose Registers table below. SPR provides an indirect method of accessing the cog's special purpose registers.

Cog RAM Special Purpose Registers
Name	Index	Type	Description
PAR	0	Read-Only	Boot Parameter
CNT	1	Read-Only	System Counter
INA	2	Read-Only	Input States for P31 - P0
INB	3	Read-Only	Input States for P63- P32¹
OUTA	4	Read/Write	Output States for P31 - P0
OUTB	5	Read/Write	Output States for P63 – P32¹
DIRA	6	Read/Write	Direction States for P31 - P0
DIRB	7	Read/Write	Direction States for P63 - P32¹
CTRA	8	Read/Write	Counter A Control
CTRB	9	Read/Write	Counter B Control
FRQA	10	Read/Write	Counter A Frequency
FRQB	11	Read/Write	Counter B Frequency
PHSA	12	Read/Write	Counter A Phase
PHSB	13	Read/Write	Counter B Phase
VCFG	14	Read/Write	Video Configuration
VSCL	15	Read/Write	Video Scale

¹Reserved for future use|

Using SPR

SPR can be used like any other long-sized array. The following assumes Temp is a variable defined elsewhere.

spr[4] := %11001010              'Set outa register
Temp   := spr[2]                 'Get ina value

This example sets the OUTA register (index 4 of SPR) to %11001010 and then sets Temp equal to the INA register (index 2 of SPR).