MC68302EH16C Freescale Semiconductor, MC68302EH16C Datasheet - Page 146
MC68302EH16C
Manufacturer Part Number
MC68302EH16C
Description
IC MPU MULTI-PROTOCOL 132-PQFP
Manufacturer
Freescale Semiconductor
Datasheets
1.MC68302AG20C.pdf
(4 pages)
2.MC68302AG20C.pdf
(2 pages)
3.MC68302AG20C.pdf
(13 pages)
4.MC68302EH16C.pdf
(481 pages)
Specifications of MC68302EH16C
Processor Type
M683xx 32-Bit
Speed
16MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
132-MQFP, 132-PQFP
Controller Family/series
68K
Core Size
32 Bit
Ram Memory Size
1152Byte
Cpu Speed
16MHz
No. Of Timers
3
Embedded Interface Type
SCP, TDM
Digital Ic Case Style
PQFP
Rohs Compliant
Yes
Family Name
M68000
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
16MHz
Instruction Set Architecture
RISC
Supply Voltage 1 (typ)
5V
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
132
Package Type
PQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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- MC68302AG20C PDF datasheet
- MC68302AG20C PDF datasheet #2
- MC68302AG20C PDF datasheet #3
- MC68302EH16C PDF datasheet #4
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- Download datasheet (2Mb)
Communications Processor (CP)
CD10–CD0—Clock Divider
When dividing by an odd number, the counter ensures a 50% duty cycle by asserting the
terminal count once on a clock high and next on a clock low. The terminal count signals the
counter expiration and toggles the clock.
DIV4—SCC Clock Prescaler Divide by 4
The SCC clock prescaler bit selects a divide-by-1 (DIV4 = 0) or divide-by-4 (DIV4 = 1) pres-
caler for the clock divider input. The divide-by-4 option is useful in generating very slow baud
rates.
4.5.2.1 Asynchronous Baud Rate Generator Examples
The UART circuitry always uses a clock that is 16x the baud rate. The ratio of the 16x UART
clock to the system parallel clock must not exceed 1:2.5. For an internally supplied clock, an
integer divider value must be used; therefore, the divider must be 3 or greater. Thus, using
a clock divider value of 3 (programmed as 2 in the SCON) and a 16.67-MHz crystal gives a
UART clock rate of 5.56 MHz and a baud rate of 347 kbaud. Assuming again a 16.67-MHz
4-26
The clock divider bits and the prescaler determine the baud rate generator output clock
rate. CD10–CD0 are used to preset an 11-bit counter that is decremented at the prescaler
output rate. The counter is not otherwise accessible to the user. When the counter reach-
es zero, it is reloaded with the clock divider bits. Thus, a value of $7FF in CD10–CD0 pro-
duces the minimum clock rate (divide by 2048); a value of $000 produces the maximum
clock rate (divide by 1).
CLOCK
MAIN
TIN 1
PIN
RCS
BIT
Because of SCC clocking restrictions, the maximum baud rate
that may be used to clock an SCC is divide by 3.
INTERNAL
R CLOCK
EXTC
MUX
MUX
BIT
Figure 4-12. SCC Baud Rate Generator
RCLK
PIN
MC68302 USER’S MANUAL
PRESCALER
DIVIDE BY
1 OR 4
DIV 4
BIT
NOTE
TCS
BIT
CD10–CD0
COUNTER
INTERNAL
T CLOCK
1-2048
11-BIT
BITS
MUX
EXTERNAL
PIN
TCLK
PIN
MOTOROLA
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