MC68306EH16B Freescale Semiconductor, MC68306EH16B Datasheet - Page 40

• Manufacturer Part Number: MC68306EH16B
• Description: IC MPU INTEGRATED 16MHZ 132-PQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68306EH16B

• 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
• Cpu Speed: 16.7MHz
• No. Of Timers: 1
• Embedded Interface Type: UART
• Digital Ic Case Style: PQFP
• Supply Voltage Range: 4.75V To 5.25V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

that uses the read-modify-write cycle) only operates on bytes. Thus, all read-modify-write
cycles are byte operations. The read-modify-write flowchart is shown in Figure 3-8 and the
timing diagram is shown in Figure 3-9.
3-8
1) SET R/W TO READ
2) PLACE FUNCTION CODE ON FC2–FC0
3) PLACE ADDRESS ON ADDRESS BUS
4) ASSERT ADDRESS STROBE (AS)
5) ASSERT UPPER DATA STROBE (UDS)
1) LATCH DATA
1) NEGATE UDS AND LDS
2) START DATA MODIFICATION
1) SET R/W TO WRITE
2) PLACE DATA ON D7–D0 OR D15–D8
3) ASSERT UPPER DATA STROBE (UDS)
1) NEGATE UDS OR LDS
2) NEGATE AS
3) REMOVE DATA FROM D7–D0 OR
4) SET R/W TO READ
OR LOWER DATA STROBE (LDS)
OR LOWER DATA STROBE (LDS)
D15–D8
TERMINATE OUTPUT TRANSFER
START OUTPUT TRANSFER
ADDRESS THE DEVICE
ACQUIRE THE DATA
START NEXT CYCLE
BUS MASTER
Figure 3-8. Read-Modify-Write Cycle Flowchart
Freescale Semiconductor, Inc.
For More Information On This Product,
MC68306 USER'S MANUAL
Go to: www.freescale.com
1) REMOVE DATA FROM D7–D0
2) NEGATE DTACK
1) DECODE ADDRESS
2) PLACE DATA ON D7–D0 OR D15–D0
3) ASSERT DATA TRANSFER
1) STORE DATA ON D7–D0 OR D15–D8
2) ASSERT DATA TRANSFER
1) NEGATE DTACK
OR D15–D8
ACKNOWLEDGE (DTACK)
ACKNOWLEDGE (DTACK)
TERMINATE THE CYCLE
TERMINATE THE CYCLE
OUTPUT THE DATA
INPUT THE DATA
SLAVE
MOTOROLA