R5S77631Y266BGV Renesas Electronics America, R5S77631Y266BGV Datasheet - Page 756

• Manufacturer Part Number: R5S77631Y266BGV
• Description: IC SUPERH MPU ROMLESS 499BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7780r

Specifications of R5S77631Y266BGV

• Core Processor: SH-4A
• Core Size: 32-Bit
• Speed: 266MHz
• Connectivity: Audio Codec, I²C, MMC, SCI, SIM, SIO, SSI, USB
• Peripherals: DMA, LCD, POR, WDT
• Number Of I /o: 107
• Program Memory Type: ROMless
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.15 V ~ 1.35 V
• Data Converters: A/D 4x10b; D/A 2x8b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 499-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

Section 18 Power-Down Mode
18.8
18.8.1
When entering the RTC power supply backup mode with the VDD power supply (1.2 V) turned
off, the VDD power supply should be turned off while the XRTCSTBI signal is held low. By
turning off the VDD power supply, the currents that might be generated in the VDD (1.2 V)
operating region can be eliminated to reduce power consumption. If the clock has been supplied
from the 32.768-Hz crystal, the RTC continues counting of its second to year counters while the
VDD (1.2 V) power supply is turned off.
18.8.2
The RTC power supply backup mode is canceled by a power-on reset. Even when any interrupt
condition is satisfied in the RTC power supply backup mode, the interrupt-generating condition
will be canceled by the power-on reset. RTC power supply backup mode can be canceled in the
following steps.
1. Turn on the VDD power supply (1.2 V) while holding the PRESET signal low.
2. Since the VDD-RTC (3.3 V), which is exclusively used for the RTC, is supplied, drive the
3. Hold the PRESET signal low until the RTC is reset by the power-on reset, and then cancel the
Table 18.5 shows the configuration of the pins related to RTC power supply backup mode.
Table 18.5 Pin Configuration
Rev. 2.00 May 22, 2009 Page 686 of 1982
REJ09B0256-0200
Pin Name
XRTCSTBI
XRTCSTBI signal high only after the power-on oscillation stabilization time has elapsed after
the VDD (1.2 V) becomes stable. This is to prevent the LSI from being damaged by the
transient current.
power-on reset.
RTC Power Supply Backup
Transition to RTC Power Supply Backup Mode
Canceling RTC Power Supply Backup Mode
Function
RTC standby
I/O
Input
Description
When this pin goes low, the LSI enters RTC
power supply backup mode.