MC68HC711P2CFN4 Freescale Semiconductor, MC68HC711P2CFN4 Datasheet - Page 128

• Manufacturer Part Number: MC68HC711P2CFN4
• Description: IC MCU 32K OTP 4MHZ 84-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC711P2CFN4

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: MI Bus, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 50
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: OTP
• Eeprom Size: 640 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 84-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Serial Peripheral Interface (SPI)
7.4.1 Clock phase and polarity controls
Technical Data
Data out (CPHA=0)
Data out (CPHA=1)
SCK (CPOL=0)
SCK (CPOL=1)
(for reference)
Sample input
Sample input
SS (to slave)
SCK cycle #
Note: this figure shows the LSBF=0 (default) case. If LSBF=1, data is transferred in the reverse order (LSB first).
MSB
Software can select one of four combinations of serial clock phase and
polarity using two bits in the SPI control register (SPCR). The clock
polarity is specified by the CPOL control bit, which selects an active high
or active low clock, and has no significant effect on the transfer format.
The clock phase (CPHA) control bit selects one of two different transfer
formats. The clock phase and polarity should be identical for the master
SPI device and the communicating slave device. In some cases, the
phase and polarity are changed between transfers to allow a master
device to communicate with peripheral slaves having different
requirements.
When CPHA equals zero, the SS line must be deasserted and
reasserted between each successive serial byte. Also, if the slave writes
data to the SPI data register (SPDR) while SS is low, a write collision
error results.
When CPHA equals one, the SS line can remain low between
MSB
Freescale Semiconductor, Inc.
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For More Information On This Product,
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Figure 7-2. SPI transfer format
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Serial Peripheral Interface (SPI)
Go to: www.freescale.com
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LSB
MC68HC11P2 — Rev 1.0
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LSB