HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 768
HD6417144
Manufacturer Part Number
HD6417144
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417144.pdf
(930 pages)
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24. Power-Down Modes
24.2.2
SYSCR is an 8-bit readable/writable register that performs AUD software reset control and
enables/disables the access to the on-chip RAM.
Bit
7, 6
5 to 2 —
1
0
Rev.4.00 Mar. 27, 2008 Page 724 of 882
REJ09B0108-0400
Bit Name
—
AUDSRST
RAME
System Control Register (SYSCR)
All 1
All 0
Initial Value
0
1
R/W
R
R
R/W
R/W
Description
Reserved
These bits are always read as 1, and should always
be written with 1.
Reserved
These bits are always read as 0, and should always
be written with 0.
AUD Software Reset
This bit controls the AUD reset by software. When 0
is written to AUDSRST, AUD module shifts to power-
on reset state.
0: Shifts to AUD reset state.
1: Clears the AUD reset.
RAM Enable
This bit enables/disables the on-chip RAM.
0: On-chip RAM disabled
1: On-chip RAM enabled
When this bit is cleared to 0, the access the on-chip
RAM is disabled. In this case, an undefined value is
returned when reading or fetching the data or
instruction from the on-chip RAM, and writing to the
on-chip RAM is ignored.
When RAME is cleared to 0 to disable the on-chip
RAM, an instruction to access the on-chip RAM
should not be set next to the instruction to write to
SYSCR. If such an instruction is set, normal access
is not guaranteed.
When RAME is set to 1 to enable the on-chip RAM,
an instruction to read SYSCR should be set next to
the instruction to write to SYSCR. If an instruction to
access the on-chip RAM is set next to the instruction
to write to SYSCR, normal access is not guaranteed.
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