R8A77800ANBGAV Renesas Electronics America, R8A77800ANBGAV Datasheet - Page 766

• Manufacturer Part Number: R8A77800ANBGAV
• Description: IC SUPERH MPU ROMLESS 449-BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7780r

Specifications of R8A77800ANBGAV

• Core Processor: SH-4A
• Core Size: 32-Bit
• Speed: 400MHz
• Connectivity: Audio Codec, MMC, Serial Sound, SCI, SIO, SPI, SSI
• Peripherals: DMA, POR, WDT
• Number Of I /o: 75
• Program Memory Type: ROMless
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.15 V ~ 1.35 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 449-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

Section 20 Realtime Clock (RTC)
20.3.5
RWKCNT is an 8-bit readable/writable register used as a counter for setting and counting the
BCD-coded day-of-week value in the RTC. It counts on the carry generated once per day by the
hour counter.
The setting range is decimal 0 to 6. The RTC will not operate normally if any other value is set.
Write processing should be performed after stopping the count with the START bit in RCR2, or
by using the carry flag.
RWKCNT is not initialized by a power-on or manual reset.
Bits 7 to 3 are always read as 0. A write to these bits is invalid, but the write value should always
be 0.
Rev.1.00 Dec. 13, 2005 Page 714 of 1286
REJ09B0158-0100
Day-of-week code
Day of week
Day-of-Week Counter (RWKCNT)
Initial value:
0
Sun
R/W:
BIt:
—
R
7
0
1
Mon
—
R
6
0
—
R
5
0
2
Tue
—
R
4
0
—
R
3
0
3
Wed
R/W
Day-of-week code
—
2
R/W
—
4
Thu
1
R/W
—
0
5
Fri
6
Sat