mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 893

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

REV—Reverse Data
This bit determines the receive and transmit character bit order.
M/S—Master/Slave
This bit configures the serial peripheral interface to operate as a master or slave.
EN—Enable SPI
This bit enables serial peripheral interface operation. Configure the SPIMOSI, SPIMISO,
SPICLK, and SPISEL pins to connect to the serial peripheral interface, as described in
Section 16.14.6 The Port B Registers. When the EN bit is cleared, the serial peripheral
interface is in a reset state and consumes minimal power, which means the SPI baud rate
generator is not functioning and the input clock is disabled.
LEN—Character Length
This field specifies the number of bits in a character. These values must be between 4 and
16 bits. If you program a value less than 4 bits, erratic behavior will occur. If the value of LEN
is less than or equal to a byte, there will be LEN number of valid bits in every byte (8 bits) in
memory. On the other hand, if the value of LEN is greater than a byte, there is LEN number
of valid bits in every half-word (16 bits) in memory.
0 = Reverse data. Least-significant bit of the character transmitted and received first.
1 = Normal operation. Most-significant bit of the character transmitted and received
0 = The serial peripheral interface is a slave.
1 = The serial peripheral interface is a master.
0 = The serial peripheral interface is disabled.
1 = The serial peripheral interface is enabled.
0011 = 4-bit character length.
0100 = 5-bit character length.
0101 = 6-bit character length.
0110 = 7-bit character length.
0111 = 8-bit character length.
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1111 = 16-bit character length.
first.
Note: You must not modify other bits of the SPMODE register when the EN bit is set.
Freescale Semiconductor, Inc.
For More Information On This Product,
MPC823 REFERENCE MANUAL
Go to: www.freescale.com
Communication Processor Module
16-441