KX-NCP1188XJ - Panasonic PBX Service Manual (repair manual). Page 8

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• nHALT signal is consistent with the existing PBX and performs polling by I/O port.

However, when the CPU (IC1) goes to Sleep Mode at HALT, the CPU (IC1) is enabled for interruption on release nHALT and
return from Sleep Mode.

• The nIRQ[0] interrupt of ASIC (IC2) is set to output and the interrupt output is to the CPU (IC1) (Mainly, DPRAM communication

interrupts).

• The LOS signal of the T1-IC (IC302) is a level output which goes "H level" at the line reference lost. Thus, 

↓ edge interruption is

available at the line reference lost by inputting the inversion signal of the LOS to the CPU (IC1). The polling operation is also pos-
sible by setting the nIRQ4 terminal of the CPU (IC1) to i/o port. 
(The configuration with the interruption processing is to give a consistency with the existing PBX.)

• Since the nRxMF signal of the T1-IC (IC302) occurs in periodic frame timing, the polling by i/o port is impossible.