122-32000 Parallax Inc, 122-32000 Datasheet - Page 320
122-32000
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
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VSCL
Video Scale Register.
((PUB ┆ PRI))
Returns: Current value of cog’s Video Scale Register, if used as a source variable.
Explanation
VSCL
Generator. Each cog has a video generator module that facilitates transmitting video image
data at a constant rate. The
PixelClocks
The 8-bit PixelClocks field indicates the number of clocks per pixel; the number of clocks
that should elapse before each pixel is shifted out by the video generator module. These
clocks are the PLLA clocks, not the System Clock.
FrameClocks
The 12-bit FrameClocks field indicates the number of clocks per frame; the number of clocks
that should elapse before each frame is shifted out by the video generator module. These
clocks are the PLLA clocks, not the System Clock. A frame is one long of pixel data
(delivered via the
bits by 1 bit (meaning 16 pixels wide with 4 colors, or 32 pixels wide with 2 colors,
respectively), the FrameClocks is typically 16 or 32 times that of the PixelClocks value.
Using VSCL
VSCL
Page 320 · Propeller Manual v1.0
VSCL
VSCL := %000000000000_10100000_101000000000
can be read/written like other registers or pre-defined variables. For example:
is one of two registers (
– Spin Language Reference
WAITVID
31..20
−
command). Since the pixel data is either 16 bits by 2 bits, or 32
VSCL
VCFG
Table 4-22: VSCL Register
register sets the rate at which video data is generated.
and
PixelClocks
VSCL Bits
VSCL
19..12
) that affect the behavior of a cog’s Video
FrameClocks
11..0
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