HD64F36024FX Datasheet, PDF (101/386 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 6 Power-Down Modes
6.2 Mode Transitions and States of LSI
Figure 6.1 shows the possible transitions among these operating modes. A transition is made from
the program execution state to the program halt state of the program by executing a SLEEP
instruction. Interrupts allow for returning from the program halt state to the program execution
state of the program. A direct transition from active mode to active mode changes the operating
frequency. RES input enables transitions from a mode to the reset state. Table 6.2 shows the
transition conditions of each mode after the SLEEP instruction is executed and a mode to return
by an interrupt. Table 6.3 shows the internal states of the LSI in each mode.
Reset state
Program halt state
Standby mode
Program execution state
SLEEP
instruction
Interrupt
Active mode
Direct transition
interrupt
SLEEP
instruction
Interrupt
SLEEP
instruction
Program halt state
Sleep mode
Interrupt
Subsleep mode
Notes: 1. To make a transition to another mode by an interrupt, make sure interrupt handling is after the interrupt
is accepted.
2. Details on the mode transition conditions are given in table 6.2.
Figure 6.1 Mode Transition Diagram
Rev. 4.00 Sep. 23, 2005 Page 73 of 354
REJ09B0025-0400