MC68340AG16VE Freescale Semiconductor, MC68340AG16VE Datasheet - Page 85

• 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: -

3.5.2 Retry Operation
When both BERR and HALT are asserted by an external device during a bus cycle, the
MC68340 enters the retry sequence shown in Figure 3-19. A delayed retry, which is
similar to the delayed BERR signal described previously, can also occur (see Figure 3-20).
The MC68340 terminates the bus cycle, places the control signals in their inactive state,
and does not begin another bus cycle until the BERR and HALT signals are negated by
external logic. After a synchronization delay, the MC68340 retries the previous cycle using
the same access information (address, function code, size, etc.). BERR should be negated
before S2 of the retried cycle to ensure correct operation of the retried cycle.
3-36
FC3–FC0
CLKOUT
DSACKx
A31–A0
D15–D0
BERR
R/W
DS
AS
Figure 3-18. Late Bus Error with DSACK
S0
Freescale Semiconductor, Inc.
For More Information On This Product,
S2
CYCLE
WRITE
MC68340 USER’S MANUAL
Go to: www.freescale.com
S4
PROCESSING
INTERNAL
S0
S2
STACK
WRITE
S4
MOTOROLA