MC9S12XET256CAG Freescale Semiconductor, MC9S12XET256CAG Datasheet - Page 378

• Manufacturer Part Number: MC9S12XET256CAG
• Description: MCU 16BIT 256K FLASH 144-LQFP
• Manufacturer: Freescale Semiconductor
• Series: HCS12r

Specifications of MC9S12XET256CAG

• Core Processor: HCS12X
• Core Size: 16-Bit
• Speed: 50MHz
• Connectivity: CAN, EBI/EMI, I²C, IrDA, 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): 1.72 V ~ 5.5 V
• Data Converters: A/D 24x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 144-LQFP
• Processor Series: S12XE
• Core: HCS12
• 3rd Party Development Tools: EWHCS12
• Development Tools By Supplier: KIT33812ECUEVME, EVB9S12XEP100, DEMO9S12XEP100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Chapter 10 XGATE (S12XGATEV3)
10.4.4
The XGATE module offers a set of eight hardware semaphores. These semaphores provide a mechanism
to protect system resources that are shared between two concurrent threads of program execution; one
thread running on the S12X_CPU and one running on the XGATE RISC core.
Each semaphore can only be in one of the three states: “Unlocked”, “Locked by S12X_CPU”, and “Locked
by XGATE”. The S12X_CPU can check and change a semaphore’s state through the XGATE semaphore
register (XGSEM, see
this through its SSEM and CSEM instructions.
IFigure 10-24
378
Because of an order from the United States International Trade Commission, BGA-packaged product lines and partnumbers
indicated here currently are not available from Freescale for import or sale in the United States prior to September 2010
XGVBR
+$0000
+$0024
+$0028
+$002C
+$0030
+$01E0
Semaphores
illustrates the valid state transitions.
Channel $09 Initial Program Counter
Channel $09 Initial Data Pointer
Channel $0A Initial Program Counter
Channel $0A Initial Data Pointer
Channel $0B Initial Program Counter
Channel $0B Initial Data Pointer
Channel $0C Initial Program Counter
Channel $0C Initial Data Pointer
Channel $78 Initial Program Counter
Channel $78 Initial Data Pointer
Section 10.3.1.10, “XGATE Semaphore Register
MC9S12XE-Family Reference Manual , Rev. 1.23
unused
Figure 10-23. XGATE Vector Block
(XGSEM)”). The RISC core does
Code
Data
Code
Data
Freescale Semiconductor