MC9S12XD256VAG Freescale Semiconductor, MC9S12XD256VAG Datasheet - Page 510
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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Chapter 11 Serial Communication Interface (S12SCIV5)
11.4.6.6.1
In this wakeup method, an idle condition on the RXD pin clears the RWU bit and wakes up the SCI. The
initial frame or frames of every message contain addressing information. All receivers evaluate the
addressing information, and receivers for which the message is addressed process the frames that follow.
Any receiver for which a message is not addressed can set its RWU bit and return to the standby state. The
RWU bit remains set and the receiver remains on standby until another idle character appears on the RXD
pin.
Idle line wakeup requires that messages be separated by at least one idle character and that no message
contains idle characters.
The idle character that wakes a receiver does not set the receiver idle bit, IDLE, or the receive data register
full flag, RDRF.
The idle line type bit, ILT, determines whether the receiver begins counting logic 1s as idle character bits
after the start bit or after the stop bit. ILT is in SCI control register 1 (SCICR1).
11.4.6.6.2
In this wakeup method, a logic 1 in the most significant bit (MSB) position of a frame clears the RWU bit
and wakes up the SCI. The logic 1 in the MSB position marks a frame as an address frame that contains
addressing information. All receivers evaluate the addressing information, and the receivers for which the
message is addressed process the frames that follow.Any receiver for which a message is not addressed can
set its RWU bit and return to the standby state. The RWU bit remains set and the receiver remains on
standby until another address frame appears on the RXD pin.
The logic 1 MSB of an address frame clears the receiver’s RWU bit before the stop bit is received and sets
the RDRF flag.
Address mark wakeup allows messages to contain idle characters but requires that the MSB be reserved
for use in address frames.
11.4.7
Normally, the SCI uses two pins for transmitting and receiving. In single-wire operation, the RXD pin is
disconnected from the SCI. The SCI uses the TXD pin for both receiving and transmitting.
510
Single-Wire Operation
Idle Input line Wakeup (WAKE = 0)
Address Mark Wakeup (WAKE = 1)
With the WAKE bit clear, setting the RWU bit after the RXD pin has been
idle can cause the receiver to wake up immediately.
Figure 11-30. Single-Wire Operation (LOOPS = 1, RSRC = 1)
Transmitter
Receiver
MC9S12XDP512 Data Sheet, Rev. 2.21
NOTE
RXD
TXD
Freescale Semiconductor
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