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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
18-20
Freescale Semiconductor
18.4.2.1.2
eTPU Coherent Dual-Parameter Controller Register (ETPU_CDCR)
ETPU_CDCR configures and controls dual-parameter coherent transfers. For more information, refer to
the eTPU reference manual.
22
SCMMISEN
SCM MISC enable. Used for enabling/disabling the operation of the MISC logic.
SCMMISEN is readable and writable at any time. The MISC logic will only operate when
this bit is set to 1. When the bit is reset the MISC address counter is set to the initial SCM
address. When enabled, the MISC will continuously cycle through the SCM addresses,
reading each and calculating a CRC. In order to save power, the MISC can be disabled by
clearing the SCMMISEN bit. For more details, refer to the eTPU reference manual.
0 MISC operation disabled. The MISC logic is reset to its initial state.
1 MISC operation enabled. (Toggling to 1 clears the SCMMISF bit)
SCMMISEN is cleared automatically when MISC logic detects an error; that is, when
SCMMISF transitions from 0 to 1, disabling the MISC operation.
23 – 24
—
Reserved.
25
VIS
SCM visibility. Determines SCM visibility to the slave bus interface and resets the MISC
state (but SCMMISEN keeps its value).
0 SCM is not visible to the slave bus. Accessing SCM address space issues a bus error.
1 SCM is visible to the slave bus. The MISC state is reset.
This bit is write protected when any of the engines are not in halt or stop states. When
VIS=1, the ETPU_ECR MDIS bits are write protected, and only 32-bit aligned SCM writes
are supported. The value written to SCM is unpredictable if other transfer sizes are used.
26 – 30
—
Reserved.
31
GTBE
Global time base enable. Enables time bases in both engines, allowing them to be started
synchronously. An assertion of GTBE also starts the eMIOS time base
1
. This enables the
eTPU time bases and the eMIOS time base to all start synchronously.
1 time bases in both eTPU engines and eMIOS are enabled to run.
0 time bases in both engines are disabled to run.
Note: When GTBE is turned off with Angle Mode enabled, the EAC must be reinitialized
before GTBE is turned on again.
1
The eMIOS also has an GTBE bit. Assertion of either the eMIOS or eTPU GTBE bit starts time bases for the eMIOS
and eTPU, see the eTPU reference manual.
Table 18-7. ETPU_MCR Bit Field Descriptions (Continued)
Bits
Name
Description
Содержание MPC5553
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