Cog RAM Special Purpose Registers

Cog RAM Map

Address

Name

Type

Description

$1F0

PAR

Read-Only1

Boot Parameter

$1F1

CNT

Read-Only1

System Counter

$1F2

INA

Read-Only1

Input States for P31–P0

$1F3

INB 3

Read-Only1

Input States for P63–P32

$1F4

OUTA

Read/Write

Output States for P31–P0

$1F5

OUTB 3

Read/Write

Output States for P63–P32

$1F6

DIRA

Read/Write

Direction States for P31–P0

$1F7

DIRB 3

Read/Write

Direction States for P63–P32

$1F8

CTRA

Read/Write

Counter A Control

$1F9

CTRB

Read/Write

Counter B Control

$1FA

FRQA

Read/Write

Counter A Frequency

$1FB

FRQB

Read/Write

Counter B Frequency

$1FC

PHSA

Read/Write2

Counter A Phase

$1FD

PHSB

Read/Write2

Counter B Phase

$1FE

VCFG

Read/Write

Video Configuration

$1FF

VSCL

Read/Write

Video Scale

  1. For Propeller Assembly, only accessible as a source register (i.e., mov dest, source). 
  2. For Propeller Assembly, only readable as a source register (i.e., mov dest, source); read modify-write not possible as a destination register.
  3. Reserved for future use.