Motorola ColdFire MCF5281 - Manual (Page 250)

Signal Descriptions
14-10 Freescale Semiconductor
JTAG_EN Selects between multiplexed debug module and JTAG signals at
reset. I
OE Indicates when an external device can drive data on the bus. O
VDDPLL Isolate the PLL analog circuitry from digital power supply noise. I
VDD Supplies positive power to the core logic and I/O pads. I
PST[3:0] Indicate core status. O
VRH, VRL High (VRH) and low (VRL) reference potentials for the analog
converter. I
VDDA, VSSA Isolate the QADC analog circuitry from digital power supply
noise. I
QADC analog supply Supplies positive power to the ESD structures in the QADC
pads. I
QSPI_CLK Provides the serial clock from the QSPI. O
QSPI_CS[3:0] Provide QSPI peripheral chip selects. O
QSPI_DIN Provides serial data to the QSPI. I
QSPI_DOUT Provides serial data from the QSPI. O
R/W Indicates the direction of the data transfer on the bus. I/O
RCON Reset configuration select. I
RSTI Asserted to enter reset exception processing. I
RSTO Automatically asserted with RSTI. Negation indicates that the
PLL has regained its lock. O
SCAS SDRAM synchronous column address strobe. O
SCKE SDRAM clock enable. O
SCL Clock signal for the I
2
C interface. I/O
SDA Data input/output for the I
2
C interface. I/O
SDRAM_CS[1:0] Interface to the chip-select lines of the SDRAMs within a
memory block. O
SIZ[1:0] Specify the data access size of the current external bus
reference. O
SRAS SDRAM synchronous row address strobe. O
VSTBY Provides standby voltage to RAM array if VDD is lost. I
SYNCA/SYNCB Clear the timer’s clock, providing a means of synchronization to
externally clocked or timed events. I
TA Indicates that the external data transfer is complete and should
be asserted for one CLKOUT cycle. I
TEA Indicates that an error condition exists for the bus transfer. I
Table 14-2. MCF5282 Alphabetical Signal Index (continued)
Abbreviation Function I/O
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3