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Chapter 8
Clock Generator
User’s Manual U16580EE3V1UD00
8.3 Power Save Control
8.3.1 Overview
The power save function of V850E/PH2 supports the HALT mode only. In this mode, the clock generator
(oscillator and PLL synthesizer) continues to operate, but the CPU’s operation clock stops. Since the
supply of clocks to on-chip peripheral functions other than the CPU continues,
operation continues. The power consumption of the overall system can be reduced by intermittent
operation that is achieved due to a combination of HALT mode and normal operation mode.
The system is switched to HALT mode by a specific instruction (the HALT instruction).
Figure 8-2 shows the operation of the clock generator in normal operation mode and HALT mode.
Figure 8-2:
Power Save Mode State Transition Diagram
Notes: 1.
Non-maskable interrupt request signal (NMI) or unmasked maskable interrupt request
signal.
2.
The oscillation stabilization time is necessary after release of reset because the PLL is
initialized by a reset. The stabilization time is determined by default.
Note 1
Normal operation mode
HALT mode
Set HALT mode
Wait for stabilization of
oscillation and PLL
RESET pin input
Interrupt request
Note 2
Summary of Contents for V850E/PH2
Page 6: ...6 Preface User s Manual U16580EE3V1UD00...
Page 16: ...16 User s Manual U16580EE3V1UD00...
Page 28: ...28 User s Manual U16580EE3V1UD00...
Page 32: ...32 User s Manual U16580EE3V1UD00...
Page 84: ...84 Chapter 2 Pin Functions User s Manual U16580EE3V1UD00 MEMO...
Page 144: ...144 Chapter 3 CPU Functions User s Manual U16580EE3V1UD00 MEMO...
Page 192: ...192 Chapter 5 Memory Access Control Function PD70F3187 only User s Manual U16580EE3V1UD00 MEMO...
Page 312: ...312 Chapter 9 16 Bit Timer Event Counter P User s Manual U16580EE3V1UD00 MEMO...
Page 534: ...534 Chapter 11 16 bit Timer Event Counter T User s Manual U16580EE3V1UD00...
Page 969: ...969 Chapter 20 Port Functions User s Manual U16580EE3V1UD00 MEMO...
Page 970: ...970 Chapter 20 Port Functions User s Manual U16580EE3V1UD00...
Page 976: ...976 Chapter 22 Internal RAM Parity Check Function User s Manual U16580EE3V1UD00 MEMO...
Page 984: ...984 Chapter 23 On Chip Debug Function OCD User s Manual U16580EE3V1UD00 MEMO...
Page 1006: ...1006 Chapter 24 Flash Memory User s Manual U16580EE3V1UD00 MEMO...
Page 1036: ...1036 Chapter 27 Recommended Soldering Conditions User s Manual U16580EE3V1UD00 MEMO...
Page 1046: ...1046 Appendix A Index User s Manual U16580EE3V1UD00 MEMO...
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