HD6417032F20V Renesas Electronics America, HD6417032F20V Datasheet - Page 188
HD6417032F20V
Manufacturer Part Number
HD6417032F20V
Description
SH1 ROMLESS LEAD FREE
Manufacturer
Renesas Electronics America
Series
SuperH® SH7030r
Datasheet
1.HD6417034AFI20.pdf
(689 pages)
Specifications of HD6417032F20V
Core Processor
SH-1
Core Size
32-Bit
Speed
20MHz
Connectivity
EBI/EMI, SCI
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
32
Program Memory Type
ROMless
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
112-QFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Program Memory Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
HD6417032F20V
Manufacturer:
TI
Quantity:
201
- Current page: 188 of 689
- Download datasheet (5Mb)
Section 8 Bus State Controller (BSC)
Self-Refresh Mode: Some DRAMs have a self-refresh mode (battery back-up mode). This is a
type of a standby mode in which the refresh timing and refresh addresses are generated inside the
DRAM chip. When the RFSHE and RMODE bits in RCR are both set to 1, the DRAM will enter
self-refresh mode when the CAS and RAS signals are output as shown in figure 8.31. See sections
20.1.3 (3) and 20.2.3 (3), Bus Timing, for details. DRAM self-refresh mode is cleared when the
RMODE bit in RCR is cleared to 0 (figure 8.31). The RFSHE bit should be left at 1 when this is
done. Some DRAM vendors recommend that after exiting self-refresh mode, all row addresses
should be refreshed again. This can be done using the BSC’s CBR refresh function to set all row
addresses for refresh in software.
To access a DRAM area while in self-refresh mode, first clear the RMODE bit to 0 and exit self-
refresh mode.
The chip can be kept in the self-refresh state and shifted to standby mode by setting it to self-
refresh mode, setting the standby bit (SBY) in the standby control register (SBYCR) to 1, and then
executing a SLEEP instruction.
Refresh Requests and Bus Cycle Requests: When a CAS-before-RAS refresh or self-refresh is
requested during bus cycle execution, parallel execution is sometimes possible. Table 8.11
summarizes the operation when refresh and bus cycles are in contention.
Rev. 7.00 Jan 31, 2006 page 160 of 658
REJ09B0272-0700
RAS
CAS
CK
T
Rp
Figure 8.31 Output Timing for Self-Refresh Signal
T
Rr
T
Rc
T
Rcc
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