The Propeller
Microcontroller is a single chip with eight built-in 32-bit
processors, called cogs. Cogs can be programmed to function
simultaneously, both independently and cooperatively with other
cogs. In other words, cogs can all function simultaneously, but
whether they function independently or cooperatively is defined by
the program. Groups of cogs can be programmed to work together,
while others work on independent tasks.
A configurable
system clock supplies all the cogs with the same clock signal (up to
80 MHz). Figure 1-1 shows how each cog takes turns at the option for
exclusive read/ write access of the Propeller chip’s main memory via
the Hub. Exclusive read/write access is important because it means
that two cogs cannot try to modify the same item in memory at the
same instance. It also prevents one cog from reading a particular
address in memory at the same time another cog is writing to it. So,
exclusive access ensures that there are never any memory access
conflicts that could corrupt data.
Propeller specification
Power
Requirements 3.3Vdc (Max current draw must be limited to 300 mA).
External Clock
Speed DC to 80 MHz (4 MHz to 8 MHz with Clock PLL running)
System Clock
Speed DC to 80 MHz
Internal RC
Oscillator 12 MHz or 20 kHz (approximate; may range from 8 MHz – 20
MHz, or 13 kHz – 33 kHz, respectively)
Main RAM/ROM 64
K bytes; 32 KB RAM + 32 KB ROM
Cog RAM 512 x 32
bits each
RAM/ROM
Organization Long (32-bit), Word (16-bit), or Byte (8-bit)
addressable
32 I/O pins.
CMOS signals with VDD/2 input threshold.
Current
Source/Sink 40mA per I/O
Current Draw @
3.3Vdc. 500 μA per MIPS (MIPS = Frequency in MHz / 4 * Number of
Active Cogs)
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