SH7032 Datasheet, PDF (491/687 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

Section 19 Power-Down State
Section 19 Power-Down State
19.1 Overview
In the power-down state, all CPU functions are halted. This lowers power consumption of the SH
microprocessor dramatically.
19.1.1 Power-Down Modes
The power-down state includes the following two modes:
1. Sleep mode
2. Standby mode
Sleep mode and standby mode are entered from the program execution state according to the
transition conditions given in table 19.1. Table 19.1 also describes procedures for exiting each
mode and the states of the CPU and supporting functions.
Table 19.1 Power-Down State
State
Entering
Mode Procedure
Supporting CPU
I/O
Exiting Procedure
Clock CPU Functions Registers RAM Ports
Sleep
mode
Execute SLEEP Runs
instruction with
SBY bit set to 0 in
SBYCR
Halted Run
Held
Held
Held
• Interrupt
• DMA address error
• Power-on reset
• Manual reset
Standby Execute SLEEP Halted
mode instruction with
SBY bit set to 1 in
SBYCR
Halted
Halted*¹
Held
Held
Held or •
high-Z*² _•
•
NMI interrupt
Power-on reset
Manual reset
SBYCR: Standby control register
SBY: Standby bit
Notes: 1. Some of the registers of the on-chip supporting modules are not initialized in standby
mode. For details, see table 19.3, Register States in Standby Mode, in section 19.4.1,
Transition to Standby Mode, or the descriptions of registers given where the on-chip
supporting modules are covered.
2. The status of I/O ports in standby mode are set by the port high-impedance bit (HIZ) in
SBYCR. See section 19.2, Standby Control Register (SBYCR), for details. The status of
pins other than the I/O ports are described in appendix B, Pin States.
Rev. 7.00 Jan 31, 2006 page 465 of 658
REJ09B0272-0700