MC908SR12CBE Freescale Semiconductor, MC908SR12CBE Datasheet - Page 121
MC908SR12CBE
Manufacturer Part Number
MC908SR12CBE
Description
IC MCU 12K FLASH 8MHZ 42-SDIP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908SR12MFAE.pdf
(404 pages)
Specifications of MC908SR12CBE
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, SCI
Peripherals
LVD, POR, PWM, Temp Sensor
Number Of I /o
29
Program Memory Size
12KB (12K x 8)
Program Memory Type
FLASH
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 11x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
42-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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Part Number:
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MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
Freescale Semiconductor
3. Calculate N:
4. Calculate and verify the adequacy of the VCO and bus
The relationship between the VCO frequency, f
reference frequency, f
where N is the integer range multiplier, between 1 and 4095.
In cases where desired bus frequency has some tolerance,
choose f
requirements (such as modules which are clocked by CGMXCLK),
cost requirements, or ideally, as high as the specified range
allows. See
reference divider, R = 1.
When the tolerance on the bus frequency is tight, choose f
an integer divisor of f
requirement, use the following equation to solve for R with
practical choices of f
lowest R.
frequencies f
Clock Generator Module (CGM)
R
=
RCLK
round R
Section 24. Electrical
VCLK
to a value determined either by other module
N
MAX
and f
=
RCLK
BUSDES
×
round
f
f
RCLK
⎧
⎨
⎩
VCLK
VCLK
f
BUS
⎛
⎜
⎝
BUS
f
------------------------- -
VCLKDES
, and choose the f
f
⎛
⎜
⎝
RCLK
, is
.
R
------------------------------------ -
=
=
=
, and R = 1. If f
f
×
RCLK
2
----------- f
2
----------- f
---------- -
2
f
f
VCLK
P
P
R
R
P
VCLKDES
N
N
×
⎞
⎟
⎠
(
(
–
×
4
RCLK
RCLK
Specifications. Choose the
integer
2
P
Clock Generator Module (CGM)
⎞
⎟
⎠
)
)
⎛
⎜
⎝
RCLK
f
------------------------- -
RCLK
VCLKDES
f
RCLK
Functional Description
VCLK
cannot meet this
that gives the
⎞
⎟
⎠
, and the
⎫
⎬
⎭
Data Sheet
RCLK
121
to
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