DS72030W200FPV Renesas Electronics America, DS72030W200FPV Datasheet - Page 1444

• Manufacturer Part Number: DS72030W200FPV
• Description: MPU, 32BIT, SH7203, ROMLESS, 240QFP
• Manufacturer: Renesas Electronics America
• Series: SH7200r

Specifications of DS72030W200FPV

• Core Size: 32bit
• Program Memory Size: 32KB
• Cpu Speed: 200MHz
• Digital Ic Case Style: QFP
• No. Of Pins: 240
• Supply Voltage Range: 1.1V To 1.3V
• Operating Temperature Range: -20°C To +85°C
• Svhc: No SVHC
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Section 28 Power-Down Modes
28.2.8
SYSCR2 is an 8-bit readable/writable register that enables or disables write to the on-chip RAM
(high-speed). Only byte access is valid.
When an RAMWE bit is set to 1, the corresponding on-chip RAM (high-speed) area is enabled.
When an RAMWE bit is cleared to 0, the corresponding on-chip RAM (high-speed) area cannot
be written to. In this case, writing to the on-chip RAM (high-speed) is ignored. The initial value of
an RAMWE bit is 1.
Note that when clearing the RAME bit to 0 to disable the on-chip RAM (high-speed), be sure to
execute an instruction to read from or write to the same arbitrary address in each page before
setting the RAMWE bit. If such an instruction is not executed, the data last written to each page
may not be written to the on-chip RAM (high-speed). Furthermore, an instruction to access the on-
chip RAM (high-speed) should not be located immediately after the instruction to write to
SYSCR2. If an on-chip RAM (high-speed) access instruction is set, normal access is not
guaranteed.
When setting the RAME bit to 1 to enable write to the on-chip RAM (high-speed), an instruction
to read SYSCR2 should be located immediately after the instruction to write to SYSCR2. If an
instruction to access the on-chip RAM (high-speed) is located immediately after the instruction to
write to SYSCR2, normal access is not guaranteed.
Note: When writing to this register, see section 28.4, Usage Notes.
Rev. 3.00 Sep. 28, 2009 Page 1412 of 1650
REJ09B0313-0300
Bit
7 to 4
3
System Control Register 2 (SYSCR2)
Bit Name
⎯
RAMWE3
Initial value:
Initial
Value
All 1
1
R/W:
Bit:
R
7
1
-
R/W
R
R/W
R
6
1
-
Description
Reserved
These bits are always read as 1. The write value
should always be 1.
RAM Write Enable 3 (corresponding area of on-chip
RAM (high-speed): page 3*)
0: Write to on-chip RAM (high-speed) disabled
1: Write to on-chip RAM (high-speed) enabled
R
5
1
-
R
4
1
-
RAM
WE3
R/W
3
1
RAM
WE2
R/W
2
1
RAM
R/W
WE1
1
1
RAM
WE0
R/W
0
1