HD643303x Hitachi, HD643303x Datasheet - Page 426

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

16.1 Overview
The H8/3032 Series has a power-down state that greatly reduces power consumption by halting
CPU functions. The power-down state includes the following three modes:
•
•
•
Table 16-1 indicates the methods of entering and exiting these power-down modes and the status
of the CPU and on-chip supporting modules in each mode.
Table 16-1 Power-Down State
Mode
Sleep
mode
Software
standby
mode
Hardware Low input at
standby
mode
Note: * The RAME bit must be cleared to 0 in SYSCR before the transition from the program execution state
Legend
SYSCR: System control register
SSBY:
Sleep mode
Software standby mode
Hardware standby mode
to hardware standby mode.
Software standby bit
Entering
Conditions
SLEEP instruc-
tion executed
while SSBY = 0
in SYSCR
SLEEP instruc-
tion executed
while SSBY = 1
in SYSCR
STBY pin
Section 16 Power-Down State
Clock
Active
Halted
Halted
CPU
Halted
Halted
Halted
CPU
Registers Functions
Held
Held
Undeter
mined
411
Supporting
Active
Halted
and
reset
Halted
and
reset
State
RAM
Held
Held
Held *
I/O
Ports
Held
Held
High
impedance • RES
Exiting
Conditions
• Interrupt
• RES
• STBY
• NMI
• IRQ
• RES
• STBY
• STBY
0
to IRQ
2