IR Remote Signal Receiver
Description
Panasonic Semiconductor Development Company MN102H75K/F75K/85K/F85K LSI User Manual
216
Panasonic
8 IR Remote Signal Receiver

8.1 Description

The MN102H75K/85K contains a remote signal receiver that processes signals in
two formats: Household Electrical Appliance Manufacturers Association
(HEAMA) format and 5-/6-bit format. This chapter provides an overview of each
block in the circuit and describes the operation of the receiver.
fSYSCLK = 12 MHz in all of the
examples and descriptions in
this section. In addition,
fPWM1 = fSYSCLK/23,
fPWM3 = fSYSCLK/25,
fPWM5 = fSYSCLK/27,
fPWM6 = fSYSCLK/28, and
fPWM8 = fSYSCLK/210.
The remote signal is input through the RMIN pin. Each time the edge detection
circuit detects the active edge of the signal, the 6-bit counter resets and the
sampling clock, TS, starts counting. TS is formed by dividing PWM3 by th e v alue
in the frequency division control register, RMTC. The clock status register,
RMCS, which can be read at any time, holds the current value of the 6-bit
counter.
The remote signal contains a leader, data, and a trailer, in that order. The micro-
controller shifts received data into the LSB of the reception data shift register,
RMSR. After it receives 8 bits, it loads the contents of RMSR to the reception
data transfer register, RMTR.