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PC312XDP512F0CFVR Fiches technique(PDF) 601 Page - Freescale Semiconductor, Inc

No de pièce PC312XDP512F0CFVR
Description  HCS12X Microcontrollers
PDF  1348 Pages
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Fabricant  FREESCALE [Freescale Semiconductor, Inc]
Site Internet  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

PC312XDP512F0CFVR Fiches technique(HTML) 601 Page - Freescale Semiconductor, Inc

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Chapter 16 Interrupt (S12XINTV1)
MC9S12XDP512 Data Sheet, Rev. 2.21
Freescale Semiconductor
601
16.3.1.1
Interrupt Vector Base Register (IVBR)
Read: Anytime
Write: Anytime
Address: 0x0121
76543210
R
IVB_ADDR[7:0]
W
Reset
11111111
Figure 16-3. Interrupt Vector Base Register (IVBR)
Table 16-2. IVBR Field Descriptions
Field
Description
7–0
IVB_ADDR[7:0]
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
the reset vector address. Therefore, changing the IVBR has no effect on the location of the three reset
vectors (0xFFFA–0xFFFE).
Note: If the BDM is active (i.e., the CPU is in the process of executing BDM firmware code), the contents of
IVBR are ignored and the upper byte of the vector address is fixed as “0xFF”.



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