MB91F155 View Datasheet(PDF) - Fujitsu
Part Name
Description
Manufacturer
MB91F155 Datasheet PDF : 104 Pages
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MB91F155/MB91154
• Condition Code Register (CCR)
S flag : Designates the stack pointer for use as R15.
I flag : Controls enabling and disabling of user interrupt requests.
N flag : Indicates the sign when arithmetic operation results are considered to be an integer represented
by 2’s complement.
Z flag : Indicates if arithmetic results were “0.”
V flag : Considers the operand used for an arithmetic operation to be an integer represented by 2’s com-
plement and indicates if the operation resulted in an overflow.
C flag : Indicates whether or not an arithmetic operation resulted in a carry or a borrow from the most sig-
nificant bit.
• System condition Code Register (SCR)
T flag : Designates whether or not to enable step trace trap.
• Interrupt Level Mask register (ILM)
ILM4 to ILM0 : Holds an interrupt level mask value to be used for level masking.
An interrupt request is accepted only if the corresponding interrupt level among interrupt
requests input to the CPU is higher than the value indicated by the ILM register.
ILM4
0
ILM3
0
ILM2
0
ILM1
0
ILM0
0
Interrupt level
0
High-Low
Higher
0
1
0
0
0
15
1
1
1
1
1
31
Lower
23
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