HD6417727BP100BV Renesas Electronics America, HD6417727BP100BV Datasheet - Page 401

• Manufacturer Part Number: HD6417727BP100BV
• Description: IC SUPERH MPU ROMLESS 240BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417727BP100BV

• Core Processor: SH-3 DSP
• Core Size: 32-Bit
• Speed: 100MHz
• Connectivity: FIFO, SCI, SIO, SmartCard, USB
• Peripherals: DMA, LCD, POR, WDT
• Number Of I /o: 104
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.6 V ~ 2.05 V
• Data Converters: A/D 6x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 240-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -

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 12.20. 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-
CKIO,
CKIO2
CKE
CSn
RAS
CAS
RD/WR
Figure 12.19 Synchronous DRAM Auto-Refresh Timing
Tp
TRr
TRrw
Rev.6.00 Mar. 27, 2009 Page 343 of 1036
Section 12 Bus State Controller (BSC)
TRrw
(Tpc)
REJ09B0254-0600