MC68340AG16VE Freescale Semiconductor, MC68340AG16VE Datasheet - Page 396

• 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: -

The method for calculating a frequency-adjusted t s is as follows:
where:
The following calculation uses a 16.78-MHz port, specification 21, R/ W high to A S
asserted, at 8 MHz as an example:
therefore:
In this manner, new specifications for lower frequencies can be derived for an MC68340.
MOTOROLA
t s = 15 ns minimum
N = 0
T f '/2 = 125/2 = 62.5 ns
T f /2 = 60/2 = 30 ns
t d1 = 30 ns maximum
t s ' = the frequency-adjusted skew
t s = the skew at full speed
N = the number of full one-half clock periods in t s , if any
T f '/2 = one-half the new clock period
T f /2 = one-half the clock period at full speed
t d1 = the propagation time for the first output from the clock edge
OUTPUT2
OUTPUT1
CLKOUT
t s ' = 15 + 0(62.5 – 30) + (62.5 – 30) = 47.5 ns minimum
Figure 10-13. Skew between Two Outputs
Freescale Semiconductor, Inc.
For More Information On This Product,
t s ' = t s + N (T f '/2 – T f /2) + (T f '/2 – t d1 )
t d1
MC68340 USER’S MANUAL
Go to: www.freescale.com
T/2
t s
t
d2
10-9