mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 346

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

Memory Map and Registers
15.4.4 INTC Programmable Level 6 Priority Registers (INTC_PL6Pn)
The level seven interrupt requests cannot have their levels reassigned. However, any of
the remaining peripheral interrupt requests can be reassigned as the highest priority
maskable requests using these two registers (INTC_PL6P7 and INTC_PL6P6). The
vector number associated with the interrupt requests does not change. Rather, only the
interrupt request's level and priority are altered, based on the contents of the
INTC_PL6P{7,6} registers.
The INTC_PL6P7 register specifies the highest-priority, maskable interrupt request that
is defined as the level six, priority seven request. The INTC_PL6P6 register specifies the
second-highest-priority, maskable interrupt request defined as the level six, priority six
request. Reset clears both registers, disabling any request re-mapping.
For an example of the use of these registers, see
Addresses: INTC_PL6P7 is FFFF_FFC0h base + 18h offset = FFFF_FFD8h
346
Reserved
REQN
Reset
Field
Read
7–6
5–0
Write
Bit
INTC_PL6P6 is FFFF_FFC0h base + 19h offset = FFFF_FFD9h
The requests associated with the INTC_FRC register have a
fixed level and priority that cannot be altered.
This read-only bitfield is reserved and always has the value zero.
Request number
Defines the peripheral IRQ number to be remapped as the level 6, priority 7 (for INTC_PL6P7) request
and level 6, priority 6 (for INTC_PL6P6) request.
NOTE: The value must be a valid interrupt number. Unused or reserved interrupt numbers are ignored.
7
0
0
The selected vector number is derived from the decimal value of the REQN field, which is n in
the following mapping formula: for vectors 64-102, n = Vector_Number - 64, while for vectors
110-114, n = Vector_Number - 71. In other words, the REQN field's minimum value is 4d
(selecting vector 68) and maximum value is 43d (selecting vector 114).
0
6
MCF51JF128 Reference Manual, Rev. 2, 03/2011
INTC_PL6Pn field descriptions
0
5
Preliminary
NOTE
0
4
Description
Using INTC_PL6P{7,6}
0
3
REQN
0
2
Freescale Semiconductor, Inc.
Registers.
0
1
0
0