MC68EN360AI25VL Freescale, MC68EN360AI25VL Datasheet - Page 642

• Manufacturer Part Number: MC68EN360AI25VL
• Manufacturer: Freescale

Specifications of MC68EN360AI25VL

• Family Name: M68000
• Device Core: ColdFire
• Device Core Size: 32b
• Frequency (max): 25MHz
• Instruction Set Architecture: RISC
• Operating Supply Voltage (max): 3.3V
• Operating Supply Voltage (min): 2.7V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 240
• Package Type: FQFP
• Lead Free Status / RoHS Status: Compliant

Serial Peripheral Interface (SPI)
M/S—Master/Slave
EN—Enable SPI
LEN—Character Length
PM3–PM0—Prescale Modulus Select
SPI Examples with Different LEN Values
These examples use LEN to illustrate using the bits described above.To help map the pro-
cess, let g through v be binary symbols, x indicates a deleted bit, __ indicates original byte
boundaries, and _ indicates original nybble (4-bit) boundaries - both are used to aid read-
ability and to help understand the process. Once the data string image is determined, it is
always transmitted byte by byte with the lsb first.
Let the memory contain the following binary image:
7-318
The M/S bit configures the SPI to work as a master or a slave.
The EN bit enables the SPI operation. Note that SPIMOSI, SPIMISO, SPICLK, and
SPISEL should be configured to connect to the SPI as described in 7.14.7 Port B Regis-
ters. When the EN bit is cleared, the SPI is in a reset state and consumes minimal pow-
er—the SPI baud rate generator is not functioning and the input clock is disabled.
The LEN field specifies how many bits are in a character. The value 0000 corresponds to
1 bit, and the value 1111 corresponds to 16 bits. Acceptable values are in the range of 4
to 16 bits inclusive. Programming a value less than 4 bits may cause erratic behavior.
If the LEN value is less than or equal to a byte, there will be LEN number of valid bits in
every byte (8 bits) in memory. If the LEN value is greater than a byte, there will be LEN
number of valid bits in every word (16 bits) in memory (See the following example).
These four bits specify the divide ratio of the prescale divider in the SPI clock generator.
The BRGCLK is divided by 4 * ([PM3–PM0] + 1) giving a clock divide ratio of 4 to 64. The
clock has a 50% duty cycle.
0 = SPI is a slave.
1 = SPI is a master.
0 = SPI is disabled.
1 = SPI is enabled.
Example 1:
with LEN=4 (data size=5), the following data is selected:
with REV=0, the data string image is:
the order of the string appearing on the line, a byte at a time is:
with REV=1, the string has each byte reversed
the data string image is:
Other bits of the SPMODE should not be modified by the user
while EN is set.
msb
msb
msb
msb
Freescale Semiconductor, Inc.
For More Information On This Product,
nmlk_j__vuts_r
MC68360 USER’S MANUAL
Go to: www.freescale.com
nmlk_j__vuts_r
ghij_klmn __opqr_stuv
xxxj_klmn__xxxr_stuv
j_klmn__r_stuv
NOTE
lsb
lsb
lsb
lsb