UPD72012中文资料瑞萨数据手册PDF规格书

FEATURES

Compliant with Chapter 11 (HUB Specifications) of USB Specification 1.1.

Descriptors into ROM

• The user can customize the vendor ID and product ID by using Mask ROM option.

Supports 5 kinds of string descriptors (for Mask ROM code product only)

On-chip sequencer

• There is an on-chip descriptor and request response sequencer. External initial setup and control is not needed

and HUB functions can be realized using only the UPD72012.

Downstream ports

• Four or five ports can be selected using a pin function.

Power modes

• Bus power or self-power can be selected using a pin function (an external power control circuit is required).

Corresponds to standard descriptor products

• Two kinds of standard ROM code products are provided. Standard and HUB class descriptors are on-chip in the UPD72012.

ROM code: 003 (individual overcurrent monitoring type Generic HUB)

ROM code: 004 (collective overcurrent monitoring type Generic HUB)

- Supports two kinds of clock input

• 48 MHz oscillator input or a 4 MHz crystal resonator can be supported

- Power control

• Port power control and overcurrent detection functions are on-chip. Individual port control or collective control can be selected for these.