MC68020RC33E Freescale Semiconductor, MC68020RC33E Datasheet - Page 73

• Manufacturer Part Number: MC68020RC33E
• Description: IC MICROPROCESSOR 32BIT 114-PGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68020RC33E

• Processor Type: M680x0 32-Bit
• Speed: 33MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 114-PGA
• Family Name: M68000
• Device Core: ColdFire
• Device Core Size: 32b
• Frequency (max): 33.33MHz
• Instruction Set Architecture: RISC
• Supply Voltage 1 (typ): 5V
• Operating Supply Voltage (max): 5.25V
• Operating Supply Voltage (min): 4.75V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Pin Count: 114
• Package Type: PGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Compliant

5.3.1 Read Cycle
During a read cycle, the processor receives data from a memory, coprocessor, or
peripheral device. If the instruction specifies a long-word operation, the MC68020/EC020
attempts to read four bytes at once. For a word operation, it attempts to read two bytes at
once and for a byte operation, one byte. For some operations, the processor requests a
three-byte transfer. The processor properly positions each byte internally. The section of
the data bus from which each byte is read depends on the operand size, A1–A0, and the
port size. Refer to 5.2.1 Dynamic Bus Sizing and 5.2.2 Misaligned Operands for more
information on dynamic bus sizing and misaligned operands.
Figure 5-19 is a flowchart of a long-word read cycle. Figure 5-20 is a flowchart of a byte
read cycle. Figures 5-21–5-23 are read cycle timing diagrams in terms of clock periods.
Figure 5-21 corresponds to byte and word read cycles from a 32-bit port. Figure 5-22
corresponds to a long-word read cycle from an 8-bit port. Figure 5-23 also applies to a
long-word read cycle, but from 16- and 32-bit ports.
5-26
*
**
*
*
*
This step does not apply to the MC68EC020.
For the MC68EC020, A23–A0.
1) ASSERT ECS/OCS FOR ONE-HALF CLOCK
2) SET R/W TO READ
3) DRIVE ADDRESS ON A31–A0
4) DRIVE FUNCTION CODE ON FC2–FC0
5) DRIVE SIZ1, SIZ0 (FOUR BYTES)
6) ASSERT AS
7) ASSERT DS
8) ASSERT DBEN
1) LATCH DATA
2) NEGATE AS AND DS
3) NEGATE DBEN
START NEXT CYCLE
ADDRESS DEVICE
ACQUIRE DATA
Figure 5-19. Long-Word Read Cycle Flowchart
PROCESSOR
Freescale Semiconductor, Inc.
For More Information On This Product,
M68020 USER’S MANUAL
Go to: www.freescale.com
1) DECODE ADDRESS
2) PLACE DATA ON D31–D0
3) ASSERT DSACK1/DSACK0
1) REMOVE DATA FROM D31–D0
2) NEGATE DSACK1/DSACK0
EXTERNAL DEVICE
TERMINATE CYCLE
PRESENT DATA
MOTOROLA