HD6417751RF240V Renesas Electronics America, HD6417751RF240V Datasheet - Page 525

• Manufacturer Part Number: HD6417751RF240V
• Description: MPU 1.5/3.3V 0K PB-FREE 256-QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7750r

Specifications of HD6417751RF240V

• Core Processor: SH-4
• Core Size: 32-Bit
• Speed: 240MHz
• Connectivity: EBI/EMI, FIFO, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 39
• Program Memory Type: ROMless
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 256-QFP Exposed Pad, 256-eQFP, 256-HQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

• Self-Refresh
The self-refreshing supported by this LSI is shown in figure 13.22.
After the self-refresh is cleared, the refresh controller immediately generates a refresh request.
The RAS precharge time immediately after the end of the self-refreshing can be set by bits
TRC2–TRC0 in MCR.
CAS-before-RAS refreshing is performed in normal operation, in sleep mode, and in the case
of a manual reset.
Self-refreshing is performed in normal operation, in sleep mode, in standby mode, and in the
case of a manual reset.
When the bus has been released in response to a bus arbitration request, or when a transition is
made to standby mode, signals generally become high-impedance, but whether the RAS and
CAS signals become high-impedance or continue to be output can be controlled by the
HIZCNT bit in BCR1. This enables the DRAM to be kept in the self-refreshing state.
Figure 13.21 DRAM CAS-Before-RAS Refresh Cycle Timing (TRAS = 0, TRC = 1)
CKIO
A25–A0
CSn
RD/WR
RAS
CAS
D31–D0
BS
TRr1
TRr2
TRr3
TRr4
TRr5
Rev.4.00 Oct. 10, 2008 Page 425 of 1122
Trc
13. Bus State Controller (BSC)
Trc
REJ09B0370-0400
Trc