MC9S08RD32CFJE Freescale Semiconductor, MC9S08RD32CFJE Datasheet - Page 111

• Manufacturer Part Number: MC9S08RD32CFJE
• Description: IC MCU 32K FLASH 8MHZ 32-LQFP
• Manufacturer: Freescale Semiconductor
• Series: HCS08r

Specifications of MC9S08RD32CFJE

• Core Processor: HCS08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 25
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

The high/low time counter is an 8-bit up counter. After each increment, the contents of the counter are
compared with the appropriate high or low count value register. When the compare value is reached, the
counter is reset to a value of $01, and the compare is redirected to the other count value register.
Assuming that the high time count compare register is currently active, a valid compare will cause the
carrier output to be driven low. The counter will continue to increment (starting at reset value of $01).
When the value stored in the selected low count value register is reached, the counter will again be reset
and the carrier output will be driven high.
The cycle repeats, automatically generating a periodic signal that is directed to the modulator. The lowest
frequency (maximum period) and highest frequency (minimum period) that can be generated are defined
as:
In the general case, the carrier generator output frequency is:
Where:
Freescale Semiconductor
CARRIER OUT (f
0 < Highcount < 256 and
0 < Lowcount < 256
MCGEN
CMTCLK
BASE
FSK
CG
)
f
CG
Figure 8-3. Carrier Generator Block Diagram
= f
MC9S08RC/RD/RE/RG Data Sheet, Rev. 1.11
f
CMTCLK
min
f
max
= f
CLK
CLR
÷ (Highcount + Lowcount) Hz
CMTCLK
= f
CMTCLK
CMTCGH2
CMTCGH1
8-BIT UP COUNTER
CMTCGL1
CMTCGL2
÷ (2 x (2
÷ (2 x 1) Hz
=?
=?
8
– 1)) Hz
Carrier Modulator Transmitter (CMT) Block Description
SECONDARY
PRIMARY/
SELECT
Eqn. 8-1
Eqn. 8-2
Eqn. 8-3
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