pef80913 Infineon Technologies Corporation, pef80913 Datasheet - Page 32

• Manufacturer Part Number: pef80913
• Description: 2b1q Second Gen. Modular Isdn Nt
• Manufacturer: Infineon Technologies Corporation

PEF 82912/82913
Functional Description
2.1.1
Serial Control Interface (SCI)
The serial control interface (SCI) is compatible to the SPI interface of Motorola and to the
Siemens C510 family of microcontrollers.
The SCI consists of 4 lines: SCLK, SDX, SDR and CS. Data is 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. The Q-SMINT I latches incoming data 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.
Pad mode of SDX can be selected ’open drain’ or ’push-pull’ by programming
MODE2.PPSDX.
Figure 6
shows the timing of a one byte read/write access via the serial control interface.
Data Sheet
18
2001-03-30