122-32000 Parallax Inc, 122-32000 Datasheet - Page 28

• Manufacturer Part Number: 122-32000
• Description: MANUAL PROPELLER
• Manufacturer: Parallax Inc

Specifications of 122-32000

• Accessory Type: Manual
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: Propeller Education (PE) Kit
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

CLK Register
The CLK register is the System Clock configuration control; it determines the source of and
the characteristics for the System Clock. More precisely, the CLK register configures the RC
Oscillator, Clock PLL, Crystal Oscillator, and Clock Selector circuits. (See Figure 1-2:
Propeller Chip Block Diagram on page 20.) It is configured at compile time by the
declaration and is writable at run time through the
register is written, a global delay of ≈75 µs occurs as the clock source transitions.
Whenever this register is changed, a copy of the value written should be placed in the Clock
Mode value location (which is BYTE[4] in Main RAM) and the resulting master clock
frequency should be written to the Clock Frequency value location (which is LONG[0] in
Main RAM) so that objects which reference this data will have current information for their
timing calculations. (See
recommended to use the
above-mentioned locations with the proper information.
Page 28 · Propeller Manual v1.0
Name
Bit
Bit
0
1
RESET
Effect
Always write ‘0’ here unless you intend to reset the chip.
Same as a hardware reset – reboots the chip. The Spin command REBOOT writes a
‘1’ to the RESET bit.
7
PLLENA OSCENA
6
CLKSET
CLKMODE
Table 1-5: CLK Register Structure
command (page 183), since it automatically updates all the
Table 1-6: RESET (Bit 7)
5
, page 179, and
OSCM1
4
CLKFREQ
OSCM0
CLKSET
3
, page 175.) When possible, it is
CLKSEL2 CLKSEL1 CLKSEL0
command. Whenever the CLK
2
1
_CLKMODE
0