Rainbow Electronics W90N745CDG User Manual

Page 10

W90N745CD/W90N745CDG

Publication Release Date: September 22, 2006

Revision

• Supports 7 bit addressing mode
• Software mode I

Universal Serial Interface (USI)
• 1-channel

USI

• Support USI (Microwire/SPI) master mode
• Full duplex synchronous serial data transfer
• Variable length of transfer word up to 32 bits
• Provide burst mode operation, transmit/receive can be executed up to four times in one transfer
• MSB or LSB first data transfer
• Rx and Tx on both rising or falling edge of serial clock independently
• Two slave/device select lines
• Fully static synchronous design with one clock domain

2-Channel AC97/I²S Audio Codec Host Interface
• AHB master port and an AHB slave port are offered in audio controller.
• Always 8-beat incrementing burst
• Always bus lock when 8-beat incrementing burst
• When reach middle and end address of destination address, a DMA_IRQ is requested to CPU

automatically

KeyPad Scan Interface
• Scan up to 16 rows by 8 columns with an external 4 to 16 decoder and 4x8 array without auxiliary

component

• Programmable debounce time
• One or two keys scan with interrupt and three keys reset function.
• Wakeup CPU from IDEL/Power Down mode

PS2 Host Interface
• APB slave consisted of PS2 protocol.
• Connect IBM keyboard or bar-code reader through PS2 interface.
• Provide hardware scan code to ASCII translation