Renesas Technology Corp.

Hidefumi Odate

Atsushi Shikata

Chiaki Kumahara

Hideo Kasai

Yasuhiro Nakamura

Motoki Kanamori

Shigeo Kurakata

Whether an initial command outputted from a host is 'CMDor 'CMDCMDis detected with an initial command detection portion, and the result of detection is set in an SD/MMC register. Reset process for hardware and that for firmware are carried out based on the result of detection set in the SD/MMC register. Thereafter, a microcomputersets data indicating in which mode, MultiMedia Card mode or SD mode, the firmware reset process was carried out, in a F/W process SD/MMC register. A H/W-F/W mode comparison circuitcompares data in the SD/MMC registerwith data in the F/W process SD/MMC register. If these data agree with each other, busy state is released, and command wait state is established. If they disagree with each other, a disagreement occurrence detection signal is outputted to the microcomputer, and power-on reset processing is performed again.

Memory card and initialization setting method thereof to avoid initializing operation failure in a memory card

A card device has a regulator (), a first internal circuit () and a second internal circuit (), and the regulator supplies, to the second internal circuit, an internal voltage generated by dropping an external voltage (VCC) when the external voltage is high, and exactly supplies the external voltage as the internal voltage to the second internal circuit when the external voltage is low, and the external voltage is supplied as an operating power source to the first internal circuit and a transition to a low consumed power state is carried out if a command is not input for a certain period. The card device stops the operation of the regulator and suppresses the supply of the internal voltage to the second internal circuit in the transition to the low consumed power state. In the low consumed power state, consequently, it is possible to suppress a power consumption in each of the regulator and the second internal circuit in the card device.

Memory card device having low consumed power in the consumed power state

A memory card and a microcomputer with nonvolatile memory wherein operation under two different types of power supply specifications achieved are provided. A MultiMediacard includes a flash memory and with the flash memory. When the controller judges the level of supply voltage supplied from host equipment, operates as follows: the controller judges whether detecting point corresponding to voltage level 1.8V system been exceeded. After the judgment of excess, the controller judges whether detecting point corresponding to the voltage level system has been exceeded. When the 1.8V system, flash memory to operate the controller causes the 1.8v-system operation mode without driving regulators voltage level shifters. When the supply voltage level 3.3V system, the controller drives the regulators and the level shifters convert the voltage level causes the flash memory operate the 3.3V-system operation mode.

Memory card and data processing system

A memory card and a microcomputer with nonvolatile memory wherein operation under two different types of power supply specifications is achieved are provided. A MultiMediaCard includes a flash memory and a controller which controls the operation associated with the flash memory. When the controller judges the level of supply voltage supplied from host equipment, it operates as follows: the controller judges whether detecting point corresponding to the voltage level of 1.8V system has been exceeded. After the judgment of excess, the controller judges whether detecting point corresponding to the voltage level of 3.3V system has been exceeded. When the supply voltage is at the voltage level of 1.8V system, the controller causes the flash memory to operate in the 1.8V-system operation mode without driving regulators or level shifters. When the supply voltage is at the voltage level of 3.3V system, the controller drives the regulators and the level shifters to convert the voltage level and causes the flash memory to operate in the 3.3V-system operation mode.

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Kodaira, Japan

Hidefumi Odate