MC9S12XDT512CAA Freescale, MC9S12XDT512CAA Datasheet - Page 496
MC9S12XDT512CAA
Manufacturer Part Number
MC9S12XDT512CAA
Description
Manufacturer
Freescale
Datasheet
1.MC9S12XDT512CAA.pdf
(1348 pages)
Specifications of MC9S12XDT512CAA
Cpu Family
HCS12
Device Core Size
16b
Frequency (max)
40MHz
Interface Type
CAN/I2C/SCI/SPI
Total Internal Ram Size
32KB
# I/os (max)
59
Number Of Timers - General Purpose
12
Operating Supply Voltage (typ)
2.5/5V
Operating Supply Voltage (max)
2.75/5.5V
Operating Supply Voltage (min)
2.35/3.15V
On-chip Adc
8-chx10-bit
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
80
Package Type
PQFP
Program Memory Type
Flash
Program Memory Size
512KB
Lead Free Status / RoHS Status
Compliant
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Part Number:
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Manufacturer:
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Quantity:
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Chapter 11 Serial Communication Interface (S12SCIV5)
11.4.4
A 13-bit modulus counter in the baud rate generator derives the baud rate for both the receiver and the
transmitter. The value from 0 to 8191 written to the SBR12:SBR0 bits determines the bus clock divisor.
The SBR bits are in the SCI baud rate registers (SCIBDH and SCIBDL). The baud rate clock is
synchronized with the bus clock and drives the receiver. The baud rate clock divided by 16 drives the
transmitter. The receiver has an acquisition rate of 16 samples per bit time.
Baud rate generation is subject to one source of error:
Table 11-15
When IREN = 0 then,
496
•
Integer division of the bus clock may not give the exact target frequency.
SCI baud rate = SCI bus clock / (16 * SCIBR[12:0])
Baud Rate Generation
lists some examples of achieving target baud rates with a bus clock frequency of 25 MHz.
SBR[12:0]
1302
2604
5208
Bits
163
326
651
41
81
Table 11-15. Baud Rates (Example: Bus Clock = 25 MHz)
1
The address bit identifies the frame as an address
character. See
Clock (Hz)
609,756.1
308,642.0
153,374.2
Receiver
76,687.1
38,402.5
19,201.2
9600.6
4800.0
MC9S12XDP512 Data Sheet, Rev. 2.21
Section 11.4.6.6, “Receiver
Transmitter
Clock (Hz)
38,109.8
19,290.1
9585.9
4792.9
2400.2
1200.1
600.0
300.0
Wakeup”.
Baud Rate
Target
38,400
19,200
9,600
4,800
2,400
1,200
600
300
Error
(%)
.76
.47
.16
.15
.01
.01
.00
.00
Freescale Semiconductor
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