MC9S12XD256VAG Freescale Semiconductor, MC9S12XD256VAG Datasheet - Page 507
MC9S12XD256VAG
Manufacturer Part Number
MC9S12XD256VAG
Description
IC MCU 256K FLASH 144-LQFP
Manufacturer
Freescale Semiconductor
Series
HCS12r
Datasheet
1.MC9S12XD64CAA.pdf
(1348 pages)
Specifications of MC9S12XD256VAG
Core Processor
HCS12X
Core Size
16-Bit
Speed
80MHz
Connectivity
CAN, EBI/EMI, I²C, IrDA, LIN, SCI, SPI
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
119
Program Memory Size
256KB (256K x 8)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
14K x 8
Voltage - Supply (vcc/vdd)
2.35 V ~ 5.5 V
Data Converters
A/D 24x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 105°C
Package / Case
144-LQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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MC9S12XD256VAG
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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.
In
noise flag but does not reset the RT clock. In start bits only, the RT8, RT9, and RT10 data samples are
ignored.
11.4.6.4
If the data recovery logic does not detect a logic 1 where the stop bit should be in an incoming frame, it
sets the framing error flag, FE, in SCI status register 1 (SCISR1). A break character also sets the FE flag
because a break character has no stop bit. The FE flag is set at the same time that the RDRF flag is set.
Freescale Semiconductor
Figure
RT Clock Count
Reset RT Clock
RT Clock Count
Reset RT Clock
RT Clock
RT Clock
Samples
Samples
11-27, a noise burst makes the majority of data samples RT8, RT9, and RT10 high. This sets the
RXD
RXD
shows a burst of noise near the beginning of the start bit that resets the RT clock. The sample
Framing Errors
1
1
1
1
1
1
1
1
1
1
Figure 11-26. Start Bit Search Example 5
1
Figure 11-27. Start Bit Search Example 6
1
1
MC9S12XDP512 Data Sheet, Rev. 2.21
1
1
1
1
1
0
0
0
0
0
1
Chapter 11 Serial Communication Interface (S12SCIV5)
Start Bit
0
Start Bit
1
1
0
0
0
No Start Bit Found
1
0
0
0
0
0
0
LSB
LSB
507
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