HD6417751RF240V Renesas Electronics America, HD6417751RF240V Datasheet - Page 490

• 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: -

13. Bus State Controller (BSC)
Bit 2—Refresh Count Overflow Flag (OVF): Status flag that indicates that the number of
refresh requests indicated by the refresh count register (RFCR) has exceeded the number specified
by the LMTS bit in RTCSR.
Bit 2: OVF
0
1
Note:
Bit 1—Refresh Count Overflow Interrupt Enable (OVIE): Controls generation or suppression
of an interrupt request when the OVF flag is set to 1 in RTCSR.
Bit 1: OVIE
0
1
Bit 0—Refresh Count Overflow Limit Select (LMTS): Specifies the count limit to be compared
with the refresh count indicated by the refresh count register (RFCR). If the RFCR register value
exceeds the value specified by LMTS, the OVF flag is set.
Bit 0: LMTS
0
1
13.2.12 Refresh Timer Counter (RTCNT)
The refresh timer counter (RTCNT) is an 8-bit readable/writable counter that is incremented by
the input clock (selected by bits CKS2–CKS0 in the RTCSR register). When the RTCNT counter
value matches the RTCOR register value, the CMF bit is set in the RTCSR register and the
RTCNT counter is cleared.
Rev.4.00 Oct. 10, 2008 Page 390 of 1122
REJ09B0370-0400
*
If 1 is written, the original value is retained.
Description
RFCR has not overflowed the count limit indicated by LMTS
[Clearing condition]
When 0 is written to OVF
RFCR has overflowed the count limit indicated by LMTS
[Setting condition]
When RFCR overflows the count limit set by LMTS*
Description
Interrupt requests initiated by OVF are disabled
Interrupt requests initiated by OVF are enabled
Description
Count limit is 1024
Count limit is 512
(Initial value)
(Initial value)
(Initial value)