Lucent Technologies MN10285K - Manual (Page 220)

IR Remote Signal Receiver
IR Remote Signal Receiver Operation
MN102H75K/F75K/85K/F85K LSI User Manual Panasonic Semiconductor Development Company
219
Panasonic
8.3.3 8-Bit Data Reception
Resetting the 8-bit data reception counter allows the microcontroller to receive 8-
bit data, either with or without a leader. The software can reset the counter using the
BCRSTE and BCEDGS bits of the interrupt status register, RMIS. The counter can
also be reset by an external reset or a hardware reset at leader detection.
Set BCRSTE to enable resets to the 8-bit data reception counter. When the
BCEDGS bit is 0, the counter resets at the first remote signal edge after each trailer
detection. This mode is for data containing no leader. (See figure 8-3.)
When BCEDGS is 1, the counter resets at the second remote signal edge after
each trailer detection. By ignoring the leader, this mode allows the microcon-
troller to receive 8-bit data that contains a leader. (See figure 8-4.)
Figure 8-3 Reception of 8-Bit Data with No Leader
Figure 8-4 Reception of 8-Bit Data with Leader
Remote
signal input
8-bit data Trailer
8-bit data
reception
counter
5
Edge
detection
8-bit data reception detection Trailer detection
6 7 0 0 1 2
8-bit data
Counter reset
8-bit data Trailer
5
8-bit data reception detection Trailer detection
6 7 0 1 0 1
8-bit data Ignored
Counter reset
Leader detection
Remote
signal input
8-bit data
reception
counter
Edge
detection