MOTOROLA
vi
MC68HC11A8
TECHNICAL DATA
9.1.2.6
9.1.2.7
9.1.2.8
9.1.2.9
9.1.2.10
9.1.2.11
9.1.3
9.1.4
9.1.5
9.2
9.2.1
9.2.2
9.2.3
9.2.4
9.2.5
9.3
9.3.1
9.3.2
Pulse Accumulator ....................................................................9-4
COP ..........................................................................................9-4
SCI Serial l/O ............................................................................9-4
SPI Serial l/O .............................................................................9-4
A/D Converter ...........................................................................9-4
System ......................................................................................9-4
Computer Operating Properly (COP) Reset ......................................9-5
Clock Monitor Reset ..........................................................................9-6
Configuration Options Register (OPTION) ........................................9-6
Interrupts ...................................................................................................9-7
Software Interrupt (SWI) ....................................................................9-9
Illegal Opcode Trap ...........................................................................9-9
Interrupt Mask Bits in Condition Code Register ................................9-9
Priority Structure ..............................................................................9-10
Highest Priority I Interrupt Register (HPRIO) ..................................9-10
Low-Power Modes ...................................................................................9-17
WAIT Instruction ..............................................................................9-17
STOP Instruction .............................................................................9-17
10 CPU, ADDRESSING MODES, AND INSTRUCTION SET
10.1
10.1.1
10.1.2
10.1.3
10.1.4
10.1.5
10.1.6
10.1.6.1
10.1.6.2
10.1.6.3
10.1.6.4
10.1.6.5
10.1.6.6
10.1.6.7
10.1.6.8
10.2
10.2.1
10.2.2
10.2.3
10.2.4
10.2.5
10.2.6
10.2.7
10.3
CPU Registers .........................................................................................10-1
Accumulators A and B .....................................................................10-1
Index Register X (IX) .......................................................................10-1
Index Register Y (IY) .......................................................................10-2
Stack Pointer (SP) ...........................................................................10-2
Program Counter (PC) ....................................................................10-2
Condition Code Register (CCR) ......................................................10-2
Carry/Borrow (C) .....................................................................10-3
Overflow (V) ............................................................................10-3
Zero (Z) ...................................................................................10-3
Negative (N) ............................................................................10-3
Interrupt Mask (I) .....................................................................10-3
Half Carry (H) ..........................................................................10-3
X Interrupt Mask (X) ................................................................10-3
Stop Disable (S) ......................................................................10-3
Addressing Modes ...................................................................................10-3
Immediate Addressing .....................................................................10-4
Direct Addressing ............................................................................10-4
Extended Addressing ......................................................................10-4
Indexed Addressing .........................................................................10-4
Inherent Addressing ........................................................................10-4
Relative Addressing ........................................................................10-4
Prebyte ............................................................................................10-5
Instruction Set .........................................................................................10-5
A ELECTRICAL CHARACTERISTICS