psb21391 Infineon Technologies Corporation, psb21391 Datasheet - Page 30

• Manufacturer Part Number: psb21391
• Description: Siemens Codec With Upn Transceiver
• Manufacturer: Infineon Technologies Corporation

Data Sheet
2.1.1
The serial control interface (SCI) is compatible to the SPI interface of Motorola or
Siemens C510 family of microcontrollers.
The SCI consists of 4 lines: SCLK, SDX, SDR and CS. Data are transferred via the lines
SDR and SDX at the rate given by SCLK. The falling edge of CS indicates the beginning
of a serial access to the registers. Incoming data is latched at the rising edge of SCLK
and shifts out at the falling edge of SCLK. Each access must be terminated by a rising
edge of CS. Data is transferred in groups of 8 bits with the MSB first.
Figure 10 shows the timing of a one byte read/write access via the serial control
interface.
Serial Control Interface (SCI)
20
PSB 21391
PSB 21393
Interfaces
2001-03-07