HD6417750SF167V Renesas Electronics America, HD6417750SF167V Datasheet - Page 547

• Manufacturer Part Number: HD6417750SF167V
• Description: MPU 3V 16K PB-FREE 208-QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7750r

Specifications of HD6417750SF167V

• Core Processor: SH-4
• Core Size: 32-Bit
• Speed: 167MHz
• Connectivity: EBI/EMI, FIFO, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 28
• Program Memory Type: ROMless
• Ram Size: 24K x 8
• Voltage - Supply (vcc/vdd): 1.6 V ~ 2 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 208-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

Refresh Timing: The bus state controller includes a function for controlling DRAM refreshing.
Distributed refreshing using a CAS-before-RAS cycle can be performed for DRAM by clearing
the RMODE bit to 0 and setting the RFSH bit to 1 in MCR. Self-refresh mode is also supported.
• CAS-before-RAS Refresh
H'00000000
RTCSR.CKS2–0
External bus
Refresh
request
RTCOR-1
When CAS-before-RAS refresh cycles are executed, refreshing is performed at intervals
determined by the input clock selected by bits CKS2–CKS0 in RTCSR, and the value set in
RTCOR. The value of bits CKS2–CKS0 in RTCOR should be set so as to satisfy the
specification for the DRAM refresh interval. First make the settings for RTCOR, RTCNT, and
the RMODE and RFSH bits in MCR, then make the CKS2–CKS0 setting. When the clock is
selected by CKS2–CKS0, RTCNT starts counting up from the value at that time. The RTCNT
value is constantly compared with the RTCOR value, and if the two values are the same, a
refresh request is generated and the BACK pin goes high. If this LSI's external bus can be
used, CAS-before-RAS refreshing is performed. At the same time, RTCNT is cleared to zero
and the count-up is restarted. Figure 13.23 shows the operation of CAS-before-RAS
refreshing.
RTCNT value
Refresh request cleared
by start of refresh cycle
Figure 13.23 CAS-Before-RAS Refresh Operation
= 000
≠ 000
CAS-before-RAS refresh cycle
RTCNT cleared to 0 when
RTCNT = RTCOR
Rev.7.00 Oct. 10, 2008 Page 461 of 1074
Section 13 Bus State Controller (BSC)
REJ09B0366-0700
Time