XC886/888CLM
Serial Interfaces
User’s Manual
12-31
V1.3, 2010-02
Serial Interfaces, V 1.0
12.3
High-Speed Synchronous Serial Interface
The SSC supports full-duplex and half-duplex synchronous communication. The serial
clock signal can be generated by the SSC internally (master mode) using its own 16-bit
baud-rate generator, or can be received from an external master (slave mode). Data
width, shift direction, clock polarity and phase are programmable. This allows
communication with SPI-compatible devices or devices using other synchronous serial
interfaces.
Data is transmitted or received on lines TXD and RXD, which are normally connected to
the pins MTSR (Master Transmit/Slave Receive) and MRST (Master Receive/Slave
Transmit). The clock signal is output via line MS_CLK (Master Serial Shift Clock) or input
via line SS_CLK (Slave Serial Shift Clock). Both lines are normally connected to the pin
SCLK. Transmission and reception of data are double-buffered.
shows the block diagram of the SSC.
Figure 12-11 Synchronous Serial Channel SSC Block Diagram
PCLK
SS_CLK
RIR
TIR
EIR
Receive Int. Request
Transmit Int. Request
Error Int. Request
Control
Status
TXD(Master)
RXD(Slave)
Shift
Clock
MS_CLK
RXD(Master)
TXD(Slave)
Internal Bus
Baud-rate
Generator
Clock
Control
SSC Control Block
Register CON
Pin
Control
8-Bit Shift Register
Transmit Buffer
Register TB
Receive Buffer
Register RB
*
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