Intel 8XC196MC, 8XC196MD, 8XC196MH manual Idle Mode, Clock Control During Power-saving Modes

Models: 8XC196MD 8XC196MH 8XC196MC

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8XC196MC, MD, MH USER’S MANUAL

XTAL1

XTAL2

 

 

 

 

 

Disable Clock Input

 

 

 

 

 

 

(Powerdown)

 

 

 

 

 

 

 

 

FXTAL1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Divide-by-two

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Circuit

Disable Clocks

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Powerdown)

 

 

 

 

 

 

 

 

 

 

 

 

 

Peripheral Clocks (PH1, PH2)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Clock

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CLKOUT

 

 

 

 

 

 

 

Generators

 

 

 

 

 

 

 

 

 

Disable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Oscillator

 

 

 

 

 

 

 

 

CPU Clocks (PH1, PH2)

 

 

 

 

 

 

 

 

 

 

(Powerdown)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Disable Clocks

 

 

 

 

 

 

 

 

 

(Idle, Powerdown)

NOTE: The CLKOUT pin is unique to the 8XC196MC and MD.

A3115-02

Figure 14-1. Clock Control During Power-saving Modes

14.3 IDLE MODE

In idle mode, the device’s power consumption decreases to approximately 40% of normal con- sumption. Internal logic holds the CPU clocks at logic zero, causing the CPU to stop executing instructions. Neither the peripheral clocks nor CLKOUT are affected, so the special-function reg- isters (SFRs) and register RAM retain their data and the peripherals and interrupt system remain active. Tables in Appendix B list the values of the pins during idle mode (see Table B-8 on page B-23 for the 8XC196MC and 8XC196MD or Table B-9 on page B-25 for the 8XC196MH).

14-4

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Intel 8XC196MC, 8XC196MD, 8XC196MH manual Idle Mode, Clock Control During Power-saving Modes