MC9S12P64VQK Freescale Semiconductor, MC9S12P64VQK Datasheet - Page 390

• Manufacturer Part Number: MC9S12P64VQK
• Description: 16-bit Microcontrollers - MCU 16 BIT 64K FLASH
• Manufacturer: Freescale Semiconductor

Specifications of MC9S12P64VQK

• Rohs: yes
• Core: S12
• Processor Series: MC9S12P
• Data Bus Width: 16 bit
• Maximum Clock Frequency: 64 MHz
• Program Memory Size: 64 KB
• Data Ram Size: 4 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 5 V
• Operating Temperature Range: - 40 C to 105 C
• Package / Case: QFP-80
• Mounting Style: SMD/SMT
• Interface Type: I2C, SCI, SPI
• Program Memory Type: Flash

Serial Communication Interface (S12SCIV5)
Figure 11-25
synchronization with the start bit time, it does set the noise flag.
Figure 11-26
after the reset is low but is not preceded by three high samples that would qualify as a falling edge.
Depending on the timing of the start bit search and on the data, the frame may be missed entirely or it may
set the framing error flag.
390
RT Clock Count
Reset RT Clock
RT Clock Count
Reset RT Clock
RT Clock
RT Clock
Samples
Samples
RXD
RXD
shows the effect of noise early in the start bit time. Although this noise does not affect proper
shows a burst of noise near the beginning of the start bit that resets the RT clock. The sample
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1
1
1
1
1
1
0
1
Figure 11-24. Start Bit Search Example 3
Figure 11-25. Start Bit Search Example 4
1
0
S12P-Family Reference Manual, Rev. 1.13
1
1
1
1
Perceived Start Bit
0
0
0
1
0
0
Perceived and Actual Start Bit
0
Actual Start Bit
Freescale Semiconductor
LSB
LSB