MC9S12NE64VTU Freescale Semiconductor, MC9S12NE64VTU Datasheet - Page 250

• Manufacturer Part Number: MC9S12NE64VTU
• Description: IC MCU 25MHZ ETHERNET/PHY 80TQFP
• Manufacturer: Freescale Semiconductor
• Series: HCS12r

Specifications of MC9S12NE64VTU

• Mfg Application Notes: MC9S12NE64 Integrated Ethernet Controller Implementing an Ethernet Interface with the MC9S12NE64 Web Server Development with MC9S12NE64 and Open TCP
• Core Processor: HCS12
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: EBI/EMI, Ethernet, I²C, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 38
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 2.375 V ~ 3.465 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 80-TQFP Exposed Pad, 80-eTQFP, 80-HTQFP, 80-VQFP
• Data Bus Width: 16 bit
• Data Ram Size: 8 KB
• Interface Type: I2C, SCI, SPI
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 70
• Number Of Timers: 16 bit
• Operating Supply Voltage: - 0.3 V to + 3 V
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 65 C
• On-chip Adc: 10 bit
• For Use With: EVB9S12NE64E - BOARD EVAL FOR 9S12NE64DEMO9S12NE64E - DEMO BOARD FOR 9S12NE64
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

Chapter 8 Serial Communication Interface (SCIV3)
indicating that the received byte can be read. If the receive interrupt enable bit, RIE, in SCI control register
2 (SCICR2) is also set, the RDRF flag generates an RDRF interrupt request.
8.4.5.3
The receiver samples the RXD pin at the RT clock rate. The RT clock is an internal signal with a frequency
16 times the baud rate. To adjust for baud rate mismatch, the RT clock (see
re-synchronized:
To locate the start bit, data recovery logic does an asynchronous search for a logic 0 preceded by three
logic 1s. When the falling edge of a possible start bit occurs, the RT clock begins to count to 16.
To verify the start bit and to detect noise, data recovery logic takes samples at RT3, RT5, and RT7.
Table 8-14
If start bit verification is not successful, the RT clock is reset and a new search for a start bit begins.
250
RT CLOCK COUNT
RESET RT CLOCK
•
•
After every start bit
After the receiver detects a data bit change from logic 1 to logic 0 (after the majority of data bit
samples at RT8, RT9, and RT10 returns a valid logic 1 and the majority of the next RT8, RT9, and
RT10 samples returns a valid logic 0)
RT CLOCK
SAMPLES
summarizes the results of the start bit verification samples.
RXD
Data Sampling
1
RT3, RT5, and RT7 Samples
1
1
1
000
001
010
011
100
101
110
111
1
QUALIFICATION
Figure 8-15. Receiver Data Sampling
1
START BIT
Table 8-14. Start Bit Verification
MC9S12NE64 Data Sheet, Rev. 1.1
1
1
0
0
VERIFICATION
Start Bit Verification
START BIT
0
Yes
Yes
Yes
Yes
No
No
No
No
0
START BIT
SAMPLING
0
DATA
0
0
Noise Flag
Figure
0
1
1
0
1
0
0
0
8-15) is
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