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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
2-41
mapped to the same ball, therefore either the FEC or calibration function can be used, but not both. The
FEC and calibration functions are not available on the MPC5554. This pin can be used as a GPIO signal.
2.3.3.1
External Transfer Size / GPIO
MPC5554 Only
TSIZ[0:1]_GPIO[60:61]
TSIZ[0:1]_GPIO[60:61] indicates the size of an external bus transfer when in external master operation or
in slave mode. The TSIZ[0:1] signals are not driven by the EBI in single master operation. The TSIZ[0:1]
signal function is not available on the MPC5553. These pins can also be used as GPIO signals for the
MPC5554 only.
2.3.3.2
External Read/Write / GPIO
RD_WR_GPIO[62]
RD_WR_GPIO[62] has a primary signal function of RD_WR for an external bus read or write operation.
The MPC5553 and MPC5554 use the RD_WR primary function for reads and writes to the external bus.
Because the MPC5553 calibration bus interface (CBI) shares the bus with the external bus interface (EBI),
the RD_WR primary function is also used for the calibration read/write function. The MPC5554 does not
have a calibration bus. This pin can be used as a GPIO signal on either the MPC5553 or MPC5554.
2.3.3.3
External Burst Data In Progress / GPIO
BDIP_GPIO[63]
BDIP_GPIO[63] has a primary signal function of external burst data in progress. This signal indicates that
the EBI is currently transferring a burst of data. This pin can be used as a GPIO signal.
2.3.3.4
Write/Byte Enable Signals
2.3.3.4.1
External Write/Byte Enable / GPIO
WE/BE[0:1]_GPIO[64:65]
WE/BE[0:1]_GPIO[64:65] has the write-enable/byte-enable signal as the primary signal function. This
signal specifies which data pins contain valid data for an external bus transfer. These pins can be used as
GPIO signals.
2.3.3.4.2
External Write/Byte Enable / Calibration Write Enable / GPIO
WE/BE[2:3]_CAL_WE/BE[0:1]_GPIO[66:67]
WE/BE[2:3]_CAL_WE/BE[0:1]_GPIO[66:67] has the write-enable/byte-enable signal as the primary
signal function. This signal specifies which data pins contain valid data for an external bus transfer. The
alternate signal function is the calibration write-enable/byte-enable signal to provide write/byte enables for
the calibration bus and is only available on the MPC5553. The calibration function is not available on the
MPC5554. These pins can be used as GPIO signals.
2.3.3.5
External Bus Output Enable / GPIO
OE_GPIO[68]
OE_GPIO[68] has a primary signal function of OE for the external bus output enable. It indicates the
calibration bus is enabled to accept read data. The MPC5553 or MPC5554 use the OE primary function to
enable the output on the external bus. Because the MPC5553 calibration bus interface (CBI) shares the bus
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