HD6417751RF240V Renesas Electronics America, HD6417751RF240V Datasheet - Page 491

• 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: -

RTCNT is initialized to H'0000 by a power-on reset, but continues to count when a manual reset is
performed. In standby mode, RTCNT is not initialized, and retains its contents.
13.2.13 Refresh Time Constant Register (RTCOR)
The refresh time constant register (RTCOR) is a readable/writable register that specifies the upper
limit of the RTCNT counter. The RTCOR register and RTCNT counter values (lower 8 bits) are
constantly compared, and when they match the CMF bit is set in the RTCSR register and the
RTCNT counter is cleared to 0. If the refresh bit (RFSH) has been set to 1 in the memory control
register (MCR) and CAS-before-RAS has been selected as the refresh mode, a memory refresh
cycle is generated when the CMF bit is set.
RTCOR is initialized to H'0000 by a power-on reset, but is not initialized, and retains its contents,
in a manual reset and in standby mode.
Initial value:
Initial value:
Initial value:
Initial value:
R/W:
R/W:
R/W:
R/W:
Bit:
Bit:
Bit:
Bit:
R/W
R/W
15
15
—
—
—
—
0
7
0
0
7
0
R/W
R/W
14
14
—
—
—
—
0
6
0
0
6
0
R/W
R/W
13
13
—
—
—
—
0
0
0
0
5
5
R/W
R/W
12
12
—
—
—
—
0
4
0
0
4
0
Rev.4.00 Oct. 10, 2008 Page 391 of 1122
R/W
R/W
11
11
—
—
—
—
0
3
0
0
3
0
13. Bus State Controller (BSC)
R/W
R/W
10
10
—
—
—
—
0
2
0
0
2
0
REJ09B0370-0400
R/W
R/W
—
—
—
—
9
0
1
0
9
0
1
0
R/W
R/W
—
—
—
—
8
0
0
0
8
0
0
0