S912XEQ384J3CAL Freescale Semiconductor, S912XEQ384J3CAL Datasheet - Page 379

• Manufacturer Part Number: S912XEQ384J3CAL
• Description: IC MCU 16BIT 384KB FLASH 112LQFP
• Manufacturer: Freescale Semiconductor
• Series: HCS12r

Specifications of S912XEQ384J3CAL

• 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: 91
• Program Memory Size: 384KB (384K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 24K x 8
• Voltage - Supply (vcc/vdd): 1.72 V ~ 5.5 V
• Data Converters: A/D 16x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 112-LQFP
• Core: HCS12X
• Data Bus Width: 16 bit
• Data Ram Size: 24 KB
• Interface Type: SCI, SPI, I2C, CAN
• Maximum Clock Frequency: 50 MHz
• Number Of Programmable I/os: 91
• Number Of Timers: 1
• Operating Supply Voltage: 3.13 V to 5.5 V
• Maximum Operating Temperature: + 260 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 10-25
Two concurrent threads are running on the system. One is running on the S12X_CPU and the other is
running on the RISC core. They both have a critical section of code that accesses the same system resource.
To guarantee that the system resource is only accessed by one thread at a time, the critical code sequence
must be embedded in a semaphore lock/release sequence as shown.
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set_xgsem: 1 is written to XGSEM[n] (and 1 is written to XGSEMM[n])
clr_xgsem: 0 is written to XGSEM[n] (and 1 is written to XGSEMM[n])
ssem:
csem:
gives an example of the typical usage of the XGATE hardware semaphores.
LOCKED BY
clr_xgsem
Executing SSEM instruction (on semaphore n)
Executing CSEM instruction (on semaphore n)
S12X_CPU
ssem &
set_xgsem
Figure 10-24. Semaphore State Transitions
MC9S12XE-Family Reference Manual Rev. 1.23
clr_xgsem
ssem & set_xgsem
UNLOCKED
csem
ssem
LOCKED BY
XGATE
csem
Chapter 10 XGATE (S12XGATEV3)
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