mc9s12xf512 Freescale Semiconductor, Inc, mc9s12xf512 Datasheet - Page 640

• Manufacturer Part Number: mc9s12xf512
• Description: S12x Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 14 XGATE (S12XGATEV3)
14.4.5
Upon detecting an error condition caused by erratic application code, the XGATE module will
immediately terminate program execution and trigger a non-maskable interrupt to the S12X_CPU. There
are three error conditions:
All opcodes which are not listed in section
opcode fetches as well as illegal load and store accesses are defined on chip level. Refer to the
S12X_MMC Section for a detailed information.
640
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Execution of an illegal opcode
Illegal opcode fetches
Illegal load or store accesses
Software Error Detection
When executing a branch (BCC, BCS,...), a jump (JAL) or an RTS
instruction, the XGATE prefetches and discards the opcode of the following
instruction. The XGATE will perform its software error handling actions
(see above) if this opcode fetch is illegal.
Figure 14-25. Algorithm for Locking and Releasing Semaphores
S12X_CPU
1 ⇒ XGSEM[n]
0 ⇒ XGSEM[n]
XGSEM[n] 1?
sequence
critical
.........
.........
code
MC9S12XF - Family Reference Manual, Rev.1.19
Section 14.8, “Instruction Set”
NOTE
XGATE
sequence
critical
CSEM
SSEM
.........
.........
BCC?
code
are illegal opcodes. Illegal
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