HD6417720BP133BV Renesas Electronics America, HD6417720BP133BV Datasheet - Page 389

• Manufacturer Part Number: HD6417720BP133BV
• Description: SH3-DSP, WITH USB AND LCDC, PB-F
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417720BP133BV

• Core Processor: SH-3 DSP
• Core Size: 32-Bit
• Speed: 133MHz
• Connectivity: FIFO, I²C, IrDA, MMC, SCI, SD, SIO, SIM, USB
• Peripherals: DMA, LCD, POR, WDT
• Number Of I /o: 117
• Program Memory Type: ROMless
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Data Converters: A/D 4x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 256-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

SH7720 Group, SH7721 Group
9.4.6
RTCNT is an 8-bit counter that increments using the clock selected by bits CKS2 to CKS0 in
RTCSR. When RTCNT matches RTCOR, RTCNT is cleared to 0. The value in RTCNT returns to
0 after counting up to 255. When the RTCNT is written, the upper 16 bits of the write data must
be H'A55A to cancel write protection.
R01UH0083EJ0400 Rev. 4.00
Sep 21, 2010
Bit
2
1
0
Bit
31 to 8
7 to 0
Refresh Timer Counter (RTCNT)
Bit Name
RRC2
RRC1
RRC0
Bit Name
⎯
⎯
Initial
Value
0
0
0
Initial
Value
All 0
All 0
R/W
R/W
R/W
R/W
R/W
R
R/W
Description
Reserved
These bits are always read as 0. The write value should
always be H'A55A00.
8-bit Counter
Description
Refresh Count
Specify the number of continuous refresh cycles, when the
refresh request occurs after the coincidence of the values of
the refresh timer counter (RTCNT) and the refresh time
constant register (RTCOR). These bits can make the period
of occurrence of refresh long.
000: Once
001: Twice
010: 4 times
011: 6 times
100: 8 times
101: Reserved (setting prohibited)
110: Reserved (setting prohibited)
111: Reserved (setting prohibited)
Section 9 Bus State Controller (BSC)
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