MC68340AG16E Freescale Semiconductor, MC68340AG16E Datasheet - Page 209
MC68340AG16E
Manufacturer Part Number
MC68340AG16E
Description
IC MPU 32BIT 16MHZ 144-LQFP
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68340FE25E.pdf
(441 pages)
Specifications of MC68340AG16E
Processor Type
M683xx 32-Bit
Speed
16MHz
Voltage
5V
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
Processor Series
M683xx
Core
CPU32
Maximum Clock Frequency
16 MHz
Maximum Operating Temperature
+ 105 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
0 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Details
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Figure 5-25 depicts the timing of the BKPT /FREEZE method. In both cases, the serial
clock is left high after the final shift of each transfer. This technique eliminates the
possibility of accidentally tagging the prefetch initiated at the conclusion of a BDM session.
As mentioned previously, all timing within the CPU is derived from the rising edge of the
clock; the falling edge is effectively ignored.
Figure 5-26 represents a sample circuit providing for both BKPT assertion methods. As
the name implies, FORCE_BGND is used to force a transition into BDM by the assertion
of BKPT . FORCE_BGND can be a short pulse or can remain asserted until FREEZE is
asserted. Once asserted, the set-reset latch holds BKPT low until the first SHIFT_CLK is
applied.
BKPT_TAG should be timed to the bus cycles since it is not latched. If extended past the
assertion of FREEZE, the negation of BKPT_TAG appears to the CPU32 as the first
DSCLK.
5-72
FORCE_BGND
FORCE_BGND
BKPT_TAG
BKPT_TAG
SHIFT_CLK
SHIFT_CLK
FREEZE
FREEZE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BKPT
BKPT
Figure 5-24. BKPT Timing for Single Bus Cycle
FORCE_BGND
SHIFT_CLK
. . . . .
Figure 5-25. BKPT Timing for Forcing BDM
BKPT_TAG
Figure 5-26. BKPT /DSCLK Logic Diagram
RESET
Freescale Semiconductor, Inc.
For More Information On This Product,
MC68340 USER’S MANUAL
Go to: www.freescale.com
S2
R
S1
Q
Q
BKPT/DSCLK
MOTOROLA
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