Datasheet

Appendix A. Migrating from the ColdFire MCF5307 to the MCF5407 A-17
Voltage Input Changes
A.8.6 Debug C Summary
The preceding section describes additional functionality requested by ColdFire customers
and third-party developers. The Debug C enhancements are designed to retain backward
compatibility with the previous definition.
A.9 Voltage Input Changes
Although the MCF5407 logic operates at 1.8 V, the device pads are standard
TTL-compatible and therefore can drive a 2.4-V minimum output and accepts a 3.3-V
input. Thus, the MCF5407 requires both 1.8- and 3.3-V power supplies. This specification
differs from the MCF5307, which operates at 3.3 V with 5-V-tolerant I/O pads. Although
the power and ground pin assignment are the same for both the MCF5307 and MCF5407,
the power pin allocation of the MCF5407 is divided between 1.8- and 3.3-V supply levels.
Thus, two power rails are necessary to supply power to the MCF5407.
Note that the MCF5407 meets the EIA/JEDEC standard for 1.8-V power supply voltage
and interface requirements. See the JEDEC standard (EIA/JESD8-7, February 1997).
A.10 PLL Power Supply Filter Circuit
To ensure PLL stability, the power supply to the PLL power pin should be filtered using a
Table A-13. Version 4 Debug C Processor Status Encodings
PSTDDATA Value Definition
0x0 Continue execution
0x1 Begin execution of one instruction
0x2 Begin execution of two instructions
0x3 Entry into user-mode
0x4 Begin execution of PULSE or WDDATA instruction
0x5 Begin execution of taken branch
0x6 Begin execution of an instruction plus a taken branch
0x7 Begin execution of RTE instruction
0x8 Begin 1-byte data transfer on PSTDDATA
0x9 Begin 2-byte data transfer on PSTDDATA
0xA Begin 3-byte data transfer on PSTDDATA
0xB Begin 4-byte data transfer on PSTDDATA
0xC Exception processing
0xD Breakpoint state change, or entry into emulator mode
0xE Processor is stopped, waiting for interrupt
0xF Processor is halted