MC68340AG16E Freescale Semiconductor, MC68340AG16E Datasheet - Page 390
![no-image](/images/manufacturer_photos/0/2/262/freescale_semiconductor_sml.jpg)
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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10.1.2 Reset Circuitry
Because it is optional, reset circuitry is not shown in Figure 10-1. The MC68340 holds
itself in reset after power-up and asserts RESET to the rest of the system. If an external
reset pushbutton switch is desired, an external reset circuit is easily constructed by using
open-collector cross-coupled NAND gates to debounce the output from the switch.
10.1.3 SRAM Interface
The SRAM interface is very simple when the programmable chip selects are used.
External circuitry to decode address information and circuitry to return data and size
acknowledge ( DSACK ) is not required. However, external ICs are required to provide
write enables for the high and low bytes of data.
The SRAM interface shown in Figure 10-5 is a two-clock interface at 16.78-MHz operating
frequency. The MCM6206C-35 memories provide an access time of 15 ns when the chip
enable ( E ) input is low. If buffers are required to reduce signal loading or if slower and less
expensive memories are desired, a three-clock cycle can be used. In the circuit shown in
Figure 10-5, additional memories can be used provided the MC68340 specification for
MOTOROLA
A15-A1
MC68340
D15-D0
SIZ0
R/W
A0
AS
CS
Figure 10-4. XFC and V
Freescale Semiconductor, Inc.
NOTE 1: Must be a low-leakage capacitor.
For More Information On This Product,
MC68340
Figure 10-5. SRAM Interface
V CCSYN
MC68340 USER’S MANUAL
Go to: www.freescale.com
XFC
LWE
UWE
CCSYN
V CCSYN
0.1 F 1
Capacitor Connections
0.1 F
MCM6206-35
R/W
. .
CE
E
. .
0.01 F
D7-D0
. .
. .
. .
. .
MCM6206-35
. .
R/W
CE
E
. .
D15-D8
. .
. .
. .
. .
10-3
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