QADC64E Enhanced Mode Operation
MPC561/MPC563 Reference Manual, Rev. 1.2
14-12
Freescale Semiconductor
The QADC64E conditionally generates interrupts to the bus master via the IMB3 IRQ signals. When the
QADC64E sets a status bit assigned to generate an interrupt, the QADC64E drives the IRQ bus. The value
driven onto IRQ[7:0] represents the interrupt level assigned to the interrupt source. Under the control of
ILBS, each interrupt request level is driven during the time multiplexed bus during one of four different
time slots, with eight levels communicated per time slot. No hardware priority is assigned to interrupts.
Furthermore, if more than one source on a module requests an interrupt at the same level, the system
software must assign a priority to each source requesting at that level.
displays the interrupt
levels on IRQ with ILBS. Refer to
Chapter 12, “U-Bus to IMB3 Bus Interface (UIMB)
” for more
information.
Figure 14-6. Interrupt Levels on IRQ with ILBS
14.3.3
Port Data Register
QADC64E ports A and B are accessed through two 8-bit port data registers, PORTQA and PORTQB.
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LSB
15
Field
IRL1
IRL2
—
SRESET
0000_0000_0000_0000
Addr
0x30 4804 (QADCINT_A); 0x30 4C04 (QADCINT_B)
Figure 14-5. QADC Interrupt Register (QADCINT)
Table 14-7. QADCINT Bit Descriptions
Bits
Name
Description
0:4
IRL1
Queue 1 Interrupt Request Level. The IRL1 field establishes the queue 1 interrupt request level.
The 00000 state provides a level 0 interrupt while 11111 provides a level 31 interrupt. All
interrupts are presented on the IMB3. Interrupt level priority software determines which level has
the highest priority request.
5:9
IRL2
Queue 2 Interrupt Request Level. The IRL2 field establishes the queue 2 interrupt request level.
The 00000 state provides a level 0 interrupt while 11111 provides a level 31 interrupt. All
interrupts are presented on the IMB3. Interrupt level priority software determines which level has
the highest priority request.
10:15
—
Reserved.
IMB3 CLOCK
ILBS [1:0]
IMB3 IRQ [7:0]
IRQ
7:0
00
01
11
10
IRQ
15:8
IRQ
23:16
IRQ
31:24
IRQ
7:0
00
01
11
10
Summary of Contents for MPC561
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Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
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Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
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