Chapter 9 XGATE (S12XGATEV2)
MC9S12XDP512 Data Sheet, Rev. 2.11
Freescale Semiconductor 395
Figure 9-21. Semaphore State Transitions
UNLOCKED
LOCKED BY
S12X_CPU
LOCKED BY
XGATE
CSEM Instruction
%0 ⇒ XGSEM
CSEM Instruction
SSEM Instruction
%1 ⇒ XGSEM
SSEM Instruction
%0 ⇒ XGSEM
%1 ⇒ XGSEM
CSEM
Instruction
%0
⇒
XGSEM
%1 ⇒
XGSEM
SSEM
Instruction
or
%1 ⇒ XGSEM
and SSEM Instr.