68HC05CL48 datasheet(88/145 Pages) MOTOROLA

88 / 145 page

GENERAL RELEASE SPECIFICATION

June 11, 1997

MOTOROLA

CALLER-ID

MC68HC05CL48

11-4

REV 2.0

11.5

POWER MANAGEMENT

If the Ring Detect module is used, it should be enabled by setting the RDPW bit

before executing the STOP instruction. When the RT signal is below the threshold

(see Figure 11-9) the oscillator circuit is forced on and the Ring Signal is

validated. If the RT rises above the threshold before the Ring Signal is validated

the oscillator will stop and the MCU will stay in the STOP mode. However, if a valid

ring is detected an interrupt is generated provided the Ring Detect Interrupt

Enable bit (RDIE) is set. The interrupt will wake the MCU from the STOP mode

and the clocks to all enabled modules will start. At this time if the CPU is not

required the WAIT mode can be entered.

If the Carrier Detect module is enabled before entering the wait mode by CDPW

bit, it will start processing the incoming data. When a valid carrier is detected an

interrupt is generated if enabled by the CDIE bit. The interrupt will take the CPU

out of the WAIT mode.

Figure 11-5. Power Up Sequence from STOP Mode

CPU STOP MODE

RDPW?

POWER ON

RDIE?

RD INTERRUPT/

YES

CPU WAIT MODE

CDPW?

POWER ON

CDIE?

CD INTERRUPT

YES

WAKE UP CPU

VALID

YES

RING DETECT

START PLL CLOCK

RT?

CARRIER DETECT

68HC05CL48 Datasheet(PDF) 88 Page - Motorola, Inc

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