MC72000 Freescale Semiconductor, MC72000 Datasheet - Page 63

• Manufacturer Part Number: MC72000
• Description: Integrated Bluetooth Radio
• Manufacturer: Freescale Semiconductor

7.3 Configurable Serial Peripheral Interface (CSPI)
The CSPI is a master/slave configurable serial peripheral interface module which allows full-duplex,
synchronous, serial communications with other peripheral devices. The CSPI is equipped with an 8 x 16
RXFIFO and an 8 x 16 TXFIFO. The CSPI incorporates the DATAREADY_B and SS_B control signals
and enables fast data communication with a fewer number of software interrupts.
7.3.1 Features
The CSPI has the following features:
7.3.2 Modes of Operation
MOTOROLA
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Full-duplex operation
Master and slave modes
Separate 8 x 16 transmit and receive FIFO registers
Eight master mode frequencies
— Maximum frequency = bus frequency ÷ 4
— Minimum frequency = bus frequency ÷ 512
Slave mode frequencies
— Maximum frequency = less than bus frequency ÷ 4
— Minimum frequency = 0
Selectable transmit and receive word lengths from 1 to 16 bits
Serial clock with programmable polarity and phase
Interrupts
— Receiver full (programmable level)
— Transmitter empty (programmable level)
— Overflow error, RXFIFO, and bit count
Master mode
NOTE:
MC71000
RXD
RTS
TXD
CTS
The above signals assume control (FCe) = 0 (enabled and control) and
(FCp) = 0 (active low RTS/CTS signals).
Freescale Semiconductor, Inc.
For More Information On This Product,
MC72000 Advance Information Data Sheet
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Figure 34. Flow Control
Preliminary
TX
I’m ready for more data
Hardware Functional Description
Remote
RXD
CTS
RTS
TXD
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