MC68340AG16VE Freescale Semiconductor, MC68340AG16VE Datasheet - Page 393

• Manufacturer Part Number: MC68340AG16VE
• Description: IC MPU 32BIT 16MHZ 144-LQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68340AG16VE

• Processor Type: M683xx 32-Bit
• Speed: 16MHz
• Voltage: 3.3V
• Mounting Type: Surface Mount
• Package / Case: 144-LQFP
• Controller Family/series: 68K
• Core Size: 32 Bit
• No. Of I/o's: 16
• Cpu Speed: 16MHz
• No. Of Timers: 2
• Embedded Interface Type: UART
• Digital Ic Case Style: LQFP
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

10.2.2 Access Time Calculations
The two time paths that are critical in an MC68340 application using the CS signals are
shown in Figure 10-10. The first path is the time from address valid to when data must be
available to the processor; the second path is the time from CS asserted to when data
must be available to the processor.
As shown in the diagram, an equation for the address access time, t ADV , can be
developed as follows:
where:
10-6
t cyc = system CLKOUT period
N c = number of clocks per bus cycle
t s6 = CLKOUT high to address valid = 30 ns maximum at 16.78 MHz
t s27 = data-in valid to CLKOUT low setup = 5 ns minimum at 16.78 MHz
CLKOUT
DSACK0
CS0
Figure 10-10. Access Time Computation Diagram
Q1
CLKOUT
D15–D0
A31–A0
S0
Freescale Semiconductor, Inc.
CS
Figure 10-9. 8-bit Boot ROM Timing
For More Information On This Product,
S1
t ADV = t cyc (N c – 0.5) – t s9 – t s27
t 6
S2
MC68340 USER’S MANUAL
S0
Go to: www.freescale.com
SW
SW
t
9
S1
t
ADV
SW
t
CSDV
SW
S4
S3
t 27
S4
S5
S5
S0
S0
S1
S2
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