MOTOROLA
Chapter 15. Clocks and Power Control
15-25
Part IV. Hardware Interface
In this conÞguration, PORESET, HRESET, and SRESET should be pulled up to KAPWR,
in order to keep them from being unintentionally sampled as asserted and causing an
unintended exit from power-down mode.
This scheme is illustrated in Figure 15-14.
Figure 15-14. Software-initiated Power-down Configuration
Switches for VDDH, VDDL, and VDDSYN are shown separately; however, if they are
actually supplied from the same source, there would in actuality be only a single switch.
When PLPRCR[TEXPS] is cleared, TEXP is deasserted and the power is shut down.
PLPRCR[TEXPS], is asserted by the MPC860 when the real-time clock or timebase time
value matches the value programmed in its associated alarm register or when the periodic
interrupt timer or decrementer decrements their value to zero, or when the HRESET signal
is externally asserted.
15.5.7.2 Maintaining the Real-Time Clock (RTC) During Shutdown or
Power Failure
The power-down conÞguration can be used simply to maintain integrity of the real-time
clock (RTC) if a power shutdown or power failure should occur. The backup KAPWR
source is used to maintain the RTC. In this conÞguration, no provision is made for
automatic wake-up from power-down mode. Instead, it is assumed that the appropriate reset
Main Power
Backup
VDDSYN
3.3V
VDDH
VDDL
KAPWR
Supply
Switch
Logic
TEXP
3.3V
SW1
SW2
Power
Supply
SW3
MPC860
PORESET
HRESET
SRESET
Summary of Contents for MPC860 PowerQUICC
Page 3: ...MPC860UM AD 07 98 REV 1 MPC860 PowerQUICC ª UserÕs Manual ...
Page 36: ...xxxvi MPC860 PowerQUICC UserÕs Manual MOTOROLA CONTENTS Paragraph Number Title Page Number ...
Page 78: ...I iv MPC860 PowerQUICC UserÕs Manual MOTOROLA Part I Overview ...
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Page 226: ...8 32 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part II PowerPC Microprocessor Module ...
Page 262: ...9 36 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part II PowerPC Microprocessor Module ...
Page 274: ...III iv MPC860 PowerQUICC UserÕs Manual MOTOROLA Part III Configuration ...
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Page 325: ...MOTOROLA Part IV Hardware Interface IV v Part IV Hardware Interface ...
Page 326: ...IV vi MPC860 PowerQUICC UserÕs Manual MOTOROLA Part IV Hardware Interface ...
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Page 632: ...21 44 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
Page 660: ...22 28 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
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Page 998: ...37 48 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part VI Debug and Test ...
Page 1016: ...A 10 MPC860 PowerQUICC UserÕs Manual MOTOROLA Appendixes ...
Page 1024: ...B 8 MPC860 PowerQUICC UserÕs Manual MOTOROLA Appendixes ...
Page 1030: ...C 6 MPC860 PowerQUICC UserÕs Manual MOTOROLA Appendixes ...
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