MC68302EH16C Freescale Semiconductor, MC68302EH16C Datasheet - Page 466

• Manufacturer Part Number: MC68302EH16C
• Description: IC MPU MULTI-PROTOCOL 132-PQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68302EH16C

• Processor Type: M683xx 32-Bit
• Speed: 16MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 132-MQFP, 132-PQFP
• Controller Family/series: 68K
• Core Size: 32 Bit
• Ram Memory Size: 1152Byte
• Cpu Speed: 16MHz
• No. Of Timers: 3
• Embedded Interface Type: SCP, TDM
• Digital Ic Case Style: PQFP
• Rohs Compliant: Yes
• Family Name: M68000
• Device Core: ColdFire
• Device Core Size: 32b
• Frequency (max): 16MHz
• Instruction Set Architecture: RISC
• Supply Voltage 1 (typ): 5V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 132
• Package Type: PQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

Design Checklist
F-2
9. Chip Select, DTAC K Generation
10. Chip Select, Option Register
11. A0–A7, D0–D7, Initialize, Reset
12. BSET Instruction, Byte
13. Exception Vector Table, Initialize, Reset
14. Stack Pointer, Initialize, Reset
15. Parameter RAM, Initialize, Reset
16. EQU, Parameter RAM
spec (see spec 32), or the total system reset may not be terminated correctly and un-
usual behavior may occur. Also, when using the RESET instruction to reset the
MC68302 internal peripherals, a strong pullup (such as 1.2K ohms) may be required
for proper rise times.
If unexpected behavior is occurring on the DTACK line, such as early or late assertion
or negation, then often the problem is traced to another component on the board that
is generating DTACK at the same time as the IMP DTACK generator. An often over-
looked source for DTACK generation is the emulator overlay memory (if an emulator
is used), which may have been inadvertently configured to overlap with a chip-select
area of the IMP. Very unusual behavior can result, especially if the number of wait
states programmed for the chip select is different from that of the overlay memory.
When setting up the chip select option register to operate as an address mask, the val-
ue programmed into the base address mask field should normally have all ones at the
left end and all zeros at the right end. Any zeros mixed between ones in the option reg-
ister base address mask field will cause multiple responses of the chip-select pin
throughout the MC68302 address space. In most applications, this is undesirable and
confusing.
The M68000 registers A0–A7 and D0–D7 do not have predefined values upon a total
system reset. The use of uninitialized (or partially uninitialized) registers can cause in-
termittent and erratic software behavior since the initialized register values may vary
from reset to reset.
To use the bit set instruction (BSET) to set a bit in the lower half of a word-sized reg-
ister or memory location, one MUST perform a byte operation on the byte address, i.e.,
word_address + 1. For example, to set bit zero of a word address $3000, one must
issue BSET.B #0,#$3001. There is no BSET.W instruction available in the MC68000.
This also applies to the BTST instruction.
Failure to provide the M68000 core exception vector table with vectors can cause er-
ratic behavior when an exception (such as bus error) occurs. Make sure that the boot
ROM/EPROM has exception vectors initialized, and that the initial reset vector causes
the program to start at an address above the vector table.
The stack pointer must be initialized to an EVEN address; otherwise, address errors
will occur when the stack is first used.
To use SCCs with specific protocols, both general-purpose parameters and protocol-
specific parameters must be initialized. Failure to initialize the parameter RAM will re-
sult in erratic behavior since the parameter RAM does not have predefined values
upon a total system reset.
Very unusual problems with the SCCs are often traced to the fact that the source code
MC68360 USER’S MANUAL
MOTOROLA