RX610 Group
8. Low Power Consumption
R01UH0032EJ0120 Rev.1.20
Page 181 of 1006
Feb 20, 2013
8.2.5
Deep Standby Control Register (DPSBYCR)
Address: 0008 C280h
b7
b6
b5
b4
b3
b2
b1
b0
Value after reset:
0
0
1
0
1
0
0
DPSBY
IOKEEP RAMCUT2 RAMCUT1
—
—
—
RAMCUT0
1
Bit
Symbol
Bit Name
Description
R/W
b0
RAMCUT0 On-Chip RAM Off 0
b5 b4 b0
0 0 0: Power is supplied to the on-chip RAM (RAM0
*
) in deep
software standby mode
1 1 1: Power is not supplied to the on-chip RAM (RAM0
*
) in deep
software standby mode
Settings other than above are prohibited.
R/W
b3 to b1
Reserved
These bits are always read as 0. The write value should always
be 0.
R/W
b4
RAMCUT1 On-Chip RAM Off 1
See the description of the RAMCUT0 bit
R/W
b5
RAMCUT2 On-Chip RAM Off 2
See the description of the RAMCUT0 bit
R/W
b6
IOKEEP
I/O Port Retention
0: Deep software standby mode and I/O port retention are
canceled simultaneously
1: I/O port retention is canceled when 0 is written to the IOKEEP
bit after deep software standby mode is canceled
R/W
b7
DPSBY
Deep Software
Standby
SSBY b7
0 0: Transition to sleep mode is made after the WAIT
instruction is executed
0 1: Transition to sleep mode is made after the WAIT
instruction is executed
1 0: Transition to software standby mode is made after the
WAIT instruction is executed
1 1: Transition to deep software standby mode is made after
the WAIT instruction is executed
R/W
Note:
*
For the on-chip RAM address space, see table 8.2.
DPSBYCR is used to control deep software standby mode.
DPSBYCR is initialized by the reset signal from the RES# pin, but is not initialized by the internal reset signal that
cancels deep software standby mode.
RAMCUTj Bits (On-Chip RAM Off j) (j = 0 to 2)
These bits control the internal power supply to the on-chip RAM modules in deep software standby mode.
The on-chip RAM address space is divided into the RAM 0 area and RAM 1 area. For the on-chip RAM address space,
see table 8.2.
Only the internal power supply of RAM0 can be controlled by the setting of bits RAMCUT0, RAMCUT1, and
RAMCUT2.
The internal power supply of RAM1 is stopped in deep software standby mode regardless of the setting of bits
RAMCUT0, RAMCUT1, and RAMCUT2.