MC68HC11E1CFN2R2 Freescale Semiconductor, MC68HC11E1CFN2R2 Datasheet - Page 135
MC68HC11E1CFN2R2
Manufacturer Part Number
MC68HC11E1CFN2R2
Description
IC MCU 512 EEPROM 2MHZ 52-PLCC
Manufacturer
Freescale Semiconductor
Series
HC11r
Datasheet
1.MC68HC11E1CFN3.pdf
(268 pages)
Specifications of MC68HC11E1CFN2R2
Core Processor
HC11
Core Size
8-Bit
Speed
3MHz
Connectivity
SCI, SPI
Peripherals
POR, WDT
Number Of I /o
38
Program Memory Type
ROMless
Eeprom Size
512 x 8
Ram Size
512 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
52-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Program Memory Size
-
Other names
MC68HC11E1CFN2TR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68HC11E1CFN2R2
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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8.4 Clock Phase and Polarity Controls
8.5 SPI Signals
M68HC11E Family — Rev. 5
MOTOROLA
1. SS ASSERTED
2. MASTER WRITES TO SPDR
3. FIRST SCK EDGE
4. SPIF SET
5. SS NEGATED
(CPHA = 0)
(CPHA = 1)
SAMPLE INPUT
SAMPLE INPUT
SCK (CPOL = 0)
SCK (CPOL = 1)
SS (TO SLAVE)
SCK CYCLE #
DATA OUT
DATA OUT
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 0, the SS line must be negated 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 1, the SS line can remain low between successive transfers.
This subsection contains descriptions of the four SPI signals:
1
•
•
•
•
2
MSB
3
Master in/slave out (MISO)
Master out/slave in (MOSI)
Serial clock (SCK)
Slave select (SS)
Freescale Semiconductor, Inc.
For More Information On This Product,
MSB
1
Figure 8-2. SPI Transfer Format
6
Serial Peripheral Interface (SPI)
Go to: www.freescale.com
2
6
SLAVE CPHA = 1 TRANSFER IN PROGRESS
SLAVE CPHA = 0 TRANSFER IN PROGRESS
5
MASTER TRANSFER IN PROGRESS
3
5
4
4
4
3
5
3
2
6
2
Clock Phase and Polarity Controls
1
Serial Peripheral Interface (SPI)
7
1
LSB
8
LSB
4
5
Data Sheet
135
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