HD6417708SF60V Renesas Electronics America, HD6417708SF60V Datasheet - Page 287
HD6417708SF60V
Manufacturer Part Number
HD6417708SF60V
Description
IC SUPERH MPU ROMLESS 208LQFP
Manufacturer
Renesas Electronics America
Series
SuperH® SH7700r
Datasheet
1.HD6417708SF60V.pdf
(635 pages)
Specifications of HD6417708SF60V
Core Processor
SH-2
Core Size
32-Bit
Speed
60MHz
Connectivity
EBI/EMI, SCI, SmartCard
Peripherals
POR, WDT
Number Of I /o
8
Program Memory Type
ROMless
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Oscillator Type
External
Operating Temperature
-20°C ~ 75°C
Package / Case
208-LQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Ram Size
-
Program Memory Size
-
Data Converters
-
Available stocks
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Manufacturer
Quantity
Price
Company:
Part Number:
HD6417708SF60V
Manufacturer:
Renesas Electronics America
Quantity:
10 000
Part Number:
HD6417708SF60V
Manufacturer:
RENESAS/瑞萨
Quantity:
20 000
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2. Self-Refreshing
Self-refresh mode is a kind of standby mode in which the refresh timing and refresh addresses are
generated within the synchronous DRAM. Self-refreshing is activated by setting both the RMODE
bit and the RFSH bit to 1. The self-refresh state is maintained while the CKE signal is low.
Synchronous DRAM cannot be accessed while in the self-refresh state. Self-refresh mode is
cleared by clearing the RMODE bit to 0. After self-refresh mode has been cleared, command
issuance is disabled for the number of cycles specified by the TPC bits in MCR. Self-refresh
timing is shown in figure 10.31. Settings must be made so that self-refresh clearing and data
retention are performed correctly, and auto-refreshing is performed at the correct intervals. When
self-refreshing is activated from the state in which auto-refreshing is set, or when exiting standby
mode other than through a power-on reset, auto-refreshing is restarted if RFSH is set to 1 and
RMODE is cleared to 0 when self-refresh mode is cleared. If the transition from clearing of self-
refresh mode to the start of auto-refreshing takes time, this time should be taken into consideration
when setting the initial value of RTCNT. Making the RTCNT value 1 less than the RTCOR value
will enable refreshing to be started immediately.
After self-refreshing has been set, the self-refresh state continues even if the chip standby state is
entered using the SH7708 Series’s standby function, and is maintained even after recovery from
standby mode other than through a power-on reset. For a power-on reset, the bus state controller’s
registers are initialized, thereby clearing the self-refresh state.
CKIO
CKE
CSn
RAS
CASxx
RD/WR
Figure 10.30 Synchronous DRAM Auto-Refresh Timing
TRr
TRrw
TRrw
(Tpc)
(Tpc)
267
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