Editing Monolog (section)

===Real time clock===
To enable the call records to be date stamped, the CMOS divider IC produces an interrupt pulse every 125 ms which activates the processor. The interrupt service routing updates the system clock and checks for any activity on the line. If there is none, the processor goes back to the SLEEP mode. In this mode, the CPU consumes very little power thereby enabling the unit to be battery powered. In its quiescent state, Monolog consumes around 180 μA while the monitored telephone line is inactive, rising to a peak of about 6 mA during a call while the DTMF decoder is on during the first 20 to 30 seconds of a call.