S912XET256J2VAGR Freescale Semiconductor, S912XET256J2VAGR Datasheet - Page 376

• Manufacturer Part Number: S912XET256J2VAGR
• Description: 16-bit Microcontrollers - MCU Watchdog OSC/Timer -40 C to + 105 C HCS12X MCU SPI
• Manufacturer: Freescale Semiconductor

Specifications of S912XET256J2VAGR

• Core: HCS12X
• Data Bus Width: 16 bit
• Maximum Clock Frequency: 50 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 16 KB
• On-chip Adc: Yes
• Package / Case: LQFP
• Mounting Style: SMD/SMT
• A/d Bit Size: 12 bit
• A/d Channels Available: 24
• Interface Type: CAN, SCI, SPI
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 119
• Number Of Timers: 25
• Program Memory Type: Flash
• Supply Voltage - Max: 1.98 V, 2.9 V, 5.5 V
• Supply Voltage - Min: 1.72 V, 2.7 V, 3.13 V

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
376
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. 1.25
unused
Figure 10-23. XGATE Vector Block
(XGSEM)”). The RISC core does
Code
Data
Code
Data
Freescale Semiconductor