MC13109 Datasheet, PDF (20/28 Pages) Motorola, Inc – Universal Cordless Telephone Subsystem IC

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Inactive Mode Operation and Hardware Interrupt
In some handset applications it may be desirable to power
Standby and Inactive modes the carrier detect circuit is
down all circuitry including the microprocessor (MPU). First
disabled and the “CD Out” pin is in a “High” state due to the
put the MC13109 into the Inactive mode, which turns off the
external pull–up resistor. In the Inactive mode the “CD Out”
MPU Clock Output (see Figure 22), and then disable the
pin is the input for the hardware interrupt function. When the
microprocessor. In order to give the MPU adequate time to
“CD Out” pin is pulled “low” by the external timing circuit, the
power down, the MPU Clock output remains active for a
MC13109 swtiches from the Inactive to the Interrupt mode
minimum of one reference counter cycle (about 200 µs) after
thereby turning on the MPU Clock Output. The MPU can then
the command is given to switch into the “Inactive” mode. An
resume control of the combo IC. The “CD Out” pin must
external timing circuit should be used to initiate the turn–on
remain low until the MPU changes the operating mode from
sequence. The “CD Out” pin has a dual function. In the Active
Interrupt to Standby, Active or Rx modes.
and Rx modes it performs the carrier detect function. In the
Mode
EN
CD Out/Hardware Interrupt
MPU Clock Out
Figure 22. Hardware Interrupt Operation
Active/Rx
Inactive
MPU Initiates
Inactive Mode
Interrupt
CD Out Low
CD Turns Off
External Timer
Pulls Pin Low
Standby/Rx/Active
MPU Initiates
Mode Change
Timer Output
Disabled
Delay after MPU selects Inactive Mode to when CD turns off.
“MPU Clock Out” remains active for a minimum of one count of reference
counter after “CD Out/Hardware Interrupt” pin goes high
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MOTOROLA ANALOG IC DEVICE DATA