U-Bus to IMB3 Bus Interface (UIMB)
MPC561/MPC563 Reference Manual, Rev. 1.2
12-8
Freescale Semiconductor
12.5.2
Test Control Register (UTSTCREG)
The UTSTCREG register is used for factory testing only.
12.5.3
Pending Interrupt Request Register (UIPEND)
The UIPEND register is a read-only status register which reflects the state of the 32 interrupt levels. The
state of IRQ0 is shown in bit 0, the state of IRQ1 is shown in bit 1 and so on. This register is accessible
only in supervisor mode.
Table 12-6. UMCR Bit Descriptions
Bits
Name
Description
0
STOP
Stop enable.
0 Enable system clock for IMB3 bus
1 Disable IMB3 system clock
To avoid complications at restart and data corruption, system software must stop each slave on
the IMB3 before setting the STOP bit. Software must also ensure that all IMB3 interrupts have
been serviced before setting this bit.
1:2
IRQMUX
Interrupt request multiplexing. These bits control the multiplexing of the 32 possible interrupt
requests onto the eight IMB3 interrupt request lines.
00 Disables the multiplexing scheme on the interrupt controller within this interface. What this
means is that the IMB3 IRQ [0:7] signals are non-multiplexed, only providing 8 [0:7] interrupt
request lines to the interrupt controller
01 Enables the IMB3 IRQ control logic to perform a 2-to-1 multiplexing to allow transferring of 16
[0:15] interrupt sources
10 Enables the IMB3 IRQ control logic to perform a 3-to-1 multiplexing to allow transferring of 24
[0:23]interrupt sources
11 Enables the IMB3 IRQ control logic to perform a 4-to-1 multiplexing to allow transferring of 32
[0:31] interrupt sources
3
HSPEED
Half speed. The HSPEED bit controls the frequency at which the IMB3 runs with respect to the
U-bus. This is a modify-once bit. Software can write the reset value of this bit any number of
times. However, once logic 0 is written to this location, any attempt to rewrite this bit to a logic 1
will have no effect.
0 IMB3 frequency is the same as that of the U-bus
1 IMB3 frequency is one half that of the U-bus
4:31
—
Reserved
Summary of Contents for MPC561
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Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
Page 854: ...Time Processor Unit 3 MPC561 MPC563 Reference Manual Rev 1 2 19 24 Freescale Semiconductor...
Page 968: ...Development Support MPC561 MPC563 Reference Manual Rev 1 2 23 54 Freescale Semiconductor...
Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...