SH7265 Datasheet, PDF (1722/2024 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 33 Power-Down Modes
Table 33.3 Pin States and Boot-Up Method after Exit form Deep Standby Mode according
to DSCTR Register Setting
CS0KEEPE RAMBOOT Boot-up
bit
bit
Method
0
0
External
bus
1
On-chip
RAM
(for data
retention)
1
0

1
On-chip
RAM
(for data
retention)
Pin States after Exit from Deep Standby Mode
The states of the external bus control pins are not
retained.
For other pins, the retention of their states is canceled
when the IOKEEP bit is cleared.
The states of the external bus control pins are not
retained.
After cancellation of deep standby mode, the retention of
the external bus control pin states is canceled.
For other pins, the retention of their states is canceled
when the IOKEEP bit is cleared.
Setting prohibited
The states of the external bus control pins are retained.
The retention of the states of the external bus control pins
and other pins is canceled when the IOKEEP bit is
cleared.
Table 33.4 External Bus Control Pins in Different Modes
Operating mode 0
(Activation through external 16-bit bus)
A[20:1]
D[15:0]
CS0, RD, CKIO
Operating mode 1
(Activation through external 32-bit bus)
A[20:2]
D[31:0]
CS0, RD, CKIO
When deep standby mode is canceled by interrupts (NMI or IRQ) or a manual reset, the deep
standby cancel source flag register (DSFR) can be used to confirm which interrupt has canceled
the mode.
Pins retain the state immediately before the transition to deep standby mode. However, in system
activation through the external bus, the retention of the states of the external bus control pins is
canceled so that programs can be fetched after cancellation of deep standby mode. The pin states
are retained after cancellation of deep standby mode until writing 0 to the IOKEEP bit in DSFR
after reading 1 from the same bit. Reconfiguration of peripheral functions is required to return to
the previous state of deep standby mode. Peripheral functions include all functions such as CPG,
Rev. 1.00 Mar. 14, 2008 Page 1686 of 1984
REJ09B0351-0100