R5F61668RN50FPV Renesas Electronics America, R5F61668RN50FPV Datasheet - Page 363

• Manufacturer Part Number: R5F61668RN50FPV
• Description: IC H8SX/1668 MCU FLASH 144LQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8SX/1600r

Specifications of R5F61668RN50FPV

• Core Processor: H8SX
• Core Size: 16/32-Bit
• Speed: 50MHz
• Connectivity: EBI/EMI, I²C, IrDA, SCI, SmartCard, USB
• Peripherals: DMA, LVD, POR, PWM, WDT
• Number Of I /o: 92
• Program Memory Size: 1MB (1M x 8)
• Program Memory Type: FLASH
• Ram Size: 56K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 144-LQFP
• For Use With: R0K561668S000BE - KIT STARTER FOR H8SX/1668R0K561664S001BE - KIT STARTER FOR H8SX/1651HS0005KCU11H - EMULATOR E10A-USB H8S(X),SH2(A)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

The time between the PALL or PRE command and the subsequent REF command can be changed
by wait cycle insertion. The number of wait cycles is selected from one to three cycles by bits
TPC1 and TPC0 in DRACCR. Set the bit according to the SDRAM to be used and the frequency
of this LSI so that the number of wait cycles can be optimal.
Figure 9.77 shows a timing example when the one wait cycles are inserted.
Precharge-sel
Address bus
Figure 9.77 Auto-Refresh Timing (TPC1 = 0, TPC0 = 1)
SDRAMφ
RD/WR
RAS
CAS
CKE
WE
CS
BS
PALL
TR
p1
TR
NOP
p2
High
High
High
REF
TR
r
Rev. 2.00 Sep. 24, 2008 Page 329 of 1468
TR
c1
NOP
Section 9 Bus Controller (BSC)
TR
c2
REJ09B0412-0200