HD6417750SBP200 Renesas Electronics America, HD6417750SBP200 Datasheet - Page 506
HD6417750SBP200
Manufacturer Part Number
HD6417750SBP200
Description
IC SUPERH MPU ROMLESS 256BGA
Manufacturer
Renesas Electronics America
Series
SuperH® SH7750r
Datasheet
1.D6417750RBP240DV.pdf
(1164 pages)
Specifications of HD6417750SBP200
Core Processor
SH-4
Core Size
32-Bit
Speed
200MHz
Connectivity
EBI/EMI, FIFO, SCI, SmartCard
Peripherals
DMA, POR, WDT
Number Of I /o
28
Program Memory Type
ROMless
Ram Size
24K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 2.07 V
Oscillator Type
External
Operating Temperature
-20°C ~ 75°C
Package / Case
256-BGA
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Program Memory Size
-
Data Converters
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
HD6417750SBP200
Manufacturer:
RENESAS/瑞萨
Quantity:
20 000
- Current page: 506 of 1164
- Download datasheet (7Mb)
Section 13 Bus State Controller (BSC)
13.2.14 Refresh Count Register (RFCR)
The refresh count register (RFCR) is a 10-bit readable/writable counter that counts the number of
refreshes by being incremented each time the RTCOR register and RTCNT counter values match.
If the RFCR register value exceeds the count limit specified by the LMTS bit in the RTCSR
register, the OVF flag is set in the RTCSR register and the RFCR register is cleared.
RFCR is initialized to H'0000 by a power-on reset, but is not initialized, and retains its contents, in
a manual reset and in standby mode.
13.2.15 Notes on Accessing Refresh Control Registers
When the refresh timer control/status register (RTCSR), refresh timer counter (RTCNT), refresh
time constant register (RTCOR), and refresh count register (RFCR) are written to, a special code
is added to the data to prevent inadvertent rewriting in the event of program runaway, etc. The
following procedures should be used for read/write operations.
Writing to RTCSR, RTCNT, RTCOR, and RFCR: A word transfer instruction must always be
used when writing to RTCSR, RTCNT, RTCOR, or RFCR. A write cannot be performed with a
byte transfer instruction.
When writing to RTCSR, RTCNT, or RTCOR, set B'10100101 in the upper byte and the write
data in the lower byte, as shown in figure 13.5. When writing to RFCR, set B'101001 in the 6 bits
starting from the MSB in the upper byte, and the write data in the remaining bits.
Rev.7.00 Oct. 10, 2008 Page 420 of 1074
REJ09B0366-0700
Initial value:
Initial value:
R/W:
R/W:
Bit:
Bit:
R/W
15
—
—
0
7
0
R/W
14
—
—
0
6
0
R/W
13
—
—
0
5
0
R/W
12
—
—
0
4
0
R/W
11
—
—
0
3
0
R/W
10
—
—
0
2
0
R/W
R/W
9
0
1
0
R/W
R/W
8
0
0
0
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