Page 308 - Programming Microcontrollers in C

The MC68HC16 293

_init_vector, * 6-Software Interrupt */
_init_vector, /* 7-Illegal Instruction */
_init_vector, /* 8-Divide by Zero */
_init_vector, /* 9-Reserved */
_init_vector, /* a-Reserved */
_init_vector, /* b-Reserved */
_init_vector, /* c-Reserved */
_init_vector, /* d-Reserved */
_init_vector, /* e-Reserved */
_init_vector, /* f-Uninitialized Interrupt */
_init_vector, /* 10-Reserved */
_init_vector, /* 11-Level 1 Interrupt Autovector */
_init_vector, /* 12-Level 2 Interrupt Autovector */
_init_vector, /* 13-Level 3 Interrupt Autovector */
_init_vector, /* 14-Level 4 Interrupt Autovector */
_init_vector, /* 15-Level 5 Interrupt Autovector */
_init_vector, /* 16-Level 6 Interrupt Autovector */
_init_vector, /* 17-Level 7 Interrupt Autovector */
_init_vector, /* 18-Spurious Interrupt */
/* vectors 0x19-0x37 unassigned, reserved */
0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
/* put timer at vector 0x46 0x40 from ICR and 6 for OC3 */
0,0,0,0,0,0,OC3_Isr/*OC3_Isrvectorat0x46addressat0x8c*/
};

static @port void _init_vector(void)
{ }

Listing 6-1: The Vector Initialization Routine vector.c
We have already seen the @port command in Chapter 5. The
@far command is unique to the Cosmic compiler. This command
notifies the compiler that the pointer associated with the command is
not the usual 16-bit pointer. An @far pointer is an extended pointer.
This 20-bit pointer will be placed into the first two memory words
by the vector.c routine. The rightmost 4 bits in word 0 is the
program counter extension PK, so that the placement of the 20-bit