MC9S12XDT256MAG Freescale Semiconductor, MC9S12XDT256MAG Datasheet - Page 496

• Manufacturer Part Number: MC9S12XDT256MAG
• Description: IC MCU 256K FLASH 144-LQFP
• Manufacturer: Freescale Semiconductor
• Series: HCS12r

Specifications of MC9S12XDT256MAG

• 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: 16K x 8
• Voltage - Supply (vcc/vdd): 2.35 V ~ 5.5 V
• Data Converters: A/D 24x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 144-LQFP
• Processor Series: S12XD
• Core: HCS12
• Data Bus Width: 16 bit
• Data Ram Size: 16 KB
• Interface Type: CAN/I2C/SCI/SPI
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 119
• Number Of Timers: 12
• Operating Supply Voltage: 0 V to 5.5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWHCS12
• Development Tools By Supplier: EVB9S12XDP512E
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 2 (24-ch x 10-bit)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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