17
13.2.25
Letterbox Button
Direct access to select the picture in letterbox aspect ratio
13.3
Remote Control Timing Definitions:
13.3.1
The modulated carrier is derived from a 432KHx clock and is 1/12 of the
frequency with a 1/3 duty cycle.
13.3.2
When data is transmitted repeatedly, the frame cycle is 113.7mS or 256T
periods.
13.3.3
A frame consists of a two-bit sync code, a one-bit toggling control code, a
five-bit system code (address) and a six-bit data code.
1 Frame
256T 256T 256T 256T
1 Frame:
S0 S1 TG C0 C1 C2 C3 C4 D0 D1 D2 D3 D4
S0, S1 = Sync (2 bit)
TG = Toggle (1 bit)
C0-C4 = Custom address code (1 bit, see below)
D0-D4 = Data code (5 bit, see table below)
Data item
Time (sec.)
Time (no. of period)
Data off time
0.888mS
2T
Data on time
0.888mS
2T
Data period (0)
3.552mS
4T
Data period (1)
3.552mS
4T
Frame output cycle
113.7mS
256T
