ST10R272L STMicroelectronics, ST10R272L Datasheet - Page 24

• Manufacturer Part Number: ST10R272L
• Description: 16-BIT Romless MCU WITH MAC UNIT
• Manufacturer: STMicroelectronics

Specifications of ST10R272L

• Cpu Frequency: 0 to 50 MHz
• Power: 3.3 Volt +/-0.3V

ST10R272L - INTERRUPT AND TRAP FUNCTIONS
6.2
Exceptions or error conditions that arise during run-time are called Hardware Traps. Hardware
traps cause immediate non-maskable system reaction similar to a standard interrupt service
(branching to a dedicated vector table location). The occurrence of a hardware trap is
additionally signified by an individual bit in the trap flag register (TFR). Except when another
higher prioritized trap service is in progress, a hardware trap will interrupt any actual program
execution. In turn, hardware trap services can not normally be interrupted by standard or PEC
interrupts. The following table shows all of the possible exceptions or error conditions that can
arise during run-time:
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Exception Condition
Reset Functions:
Class A Hardware Traps:
Class B Hardware Traps:
Reserved
Software Traps
Hardware Reset
Software Reset
Watchdog Timer Overflow
Non-Maskable Interrupt
Stack Overflow
Stack Underflow
Undefined opcode
Protected instruction fault
Illegal word operand access ILLOPA
Illegal instruction access
Illegal external bus access
MAC trap
TRAP Instruction
Hardware Traps
Table 6 Exceptions or error conditions
Trap Flag
NMI
STKOF
STKUF
UNDOPC
PRTFLT
ILLINA
ILLBUS
MACTRP
Trap Vector
RESET
RESET
RESET
NMITRAP
STOTRAP
STUTRAP
BTRAP
BTRAP
BTRAP
BTRAP
BTRAP
BTRAP
Vector
Location
00’0000
00’0000
00’0000
00’0008
00’0010
00’0018
00’0028h
00’0028h
00’0028h
00’0028h
00’0028h
00’0028h
[2C
Any [00’0000
– 00’01FC
steps of 4
h
– 3C
h
h
h
h
h
h
h
h
h
]
]
h
Trap
Number
00
00
00
02
04
06
0A
0A
0A
0A
0A
0A
[0B
Any
[00
h
h
h
h
h
h
h
h
h
h
h
h
h
h
– 7F
– 0F
h
h
]
]
Trap
Priority
III
III
III
II
II
II
I
I
I
I
I
I
Current
CPU
Priority