mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 601

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

16.3.1.1
Read: Anytime
Write: Anytime
Freescale Semiconductor
Address: 0x0121
IVB_ADDR[7:0]
Reset
Field
7–0
W
R
Interrupt Vector Base Register (IVBR)
1
7
Interrupt Vector Base Address Bits — These bits represent the upper byte of all vector addresses. Out of
reset these bits are set to 0xFF (i.e., vectors are located at 0xFF10–0xFFFE) to ensure compatibility to
HCS12.
Note: A system reset will initialize the interrupt vector base register with “0xFF” before it is used to determine
Note: If the BDM is active (i.e., the CPU is in the process of executing BDM firmware code), the contents of
the reset vector address. Therefore, changing the IVBR has no effect on the location of the three reset
vectors (0xFFFA–0xFFFE).
IVBR are ignored and the upper byte of the vector address is fixed as “0xFF”.
1
6
Figure 16-3. Interrupt Vector Base Register (IVBR)
Table 16-2. IVBR Field Descriptions
MC9S12XDP512 Data Sheet, Rev. 2.17
1
5
1
4
IVB_ADDR[7:0]
Description
1
3
1
2
Chapter 16 Interrupt (S12XINTV1)
1
1
1
0
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