MC9S08RE16FDE Freescale Semiconductor, MC9S08RE16FDE Datasheet - Page 115
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MC9S08RE16FDE
Manufacturer Part Number
MC9S08RE16FDE
Description
IC MCU 16K FLASH 1K RAM 48-QFN
Manufacturer
Freescale Semiconductor
Series
HCS08r
Specifications of MC9S08RE16FDE
Core Processor
HCS08
Core Size
8-Bit
Speed
8MHz
Connectivity
SCI
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
39
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
48-QFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
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The space period provides an interpulse gap (no carrier). If CMTCMD3:CMTCMD4 = $0000, then the
modulator and carrier generator will switch between carrier frequencies without a gap or any carrier
glitches (zero space).
Using timing data for carrier burst and interpulse gap length calculated by the CPU, FSK mode can
automatically generate a phase-coherent, dual-frequency FSK signal with programmable burst and
interburst gaps.
The mark and space time equations for FSK mode are:
Where f
IRO pin output looks like in FSK mode with the following values: CMTCMD1:CMTCMD2 = $0003,
CMTCMD3:CMTCMD4 = $0002, primary carrier high count = $01, primary carrier low count = $02,
secondary carrier high count = $03, and secondary carrier low count = $01.
8.5.3
In time, baseband, or FSK mode, the space period can be made longer than the maximum possible value
of the space period register. Setting the EXSPC bit in the CMTMSC register will force the modulator to
treat the next modulation period (beginning with the next load of the counter and space period register) as
a space period equal in length to the mark and space counts combined. Subsequent modulation periods will
consist entirely of these extended space periods with no mark periods. Clearing EXSPC will return the
modulator to standard operation at the beginning of the next modulation period.
8.5.3.1
To calculate the length of an extended space in time or baseband modes, add the mark and space times and
multiply by the number of modulation periods that EXSPC is set.
Freescale Semiconductor
MODULATOR GATE
CARRIER OUT (f
IRO PIN
CG
is the frequency output from the carrier generator. The example in
Extended Space Operation
EXSPC Operation in Time Mode
CG
)
MARK1
t
mark
Figure 8-6. Example CMT Output in FSK Mode
SPACE1
t
space
MC9S08RC/RD/RE/RG Data Sheet, Rev. 1.11
= (CMTCMD1:CMTCMD2 + 1) ÷ f
= CMTCMD3:CMTCMD4 ÷ f
MARK2
SPACE2
MARK1
Carrier Modulator Transmitter (CMT) Block Description
CG
CG
SPACE1
Figure 8-6
MARK2
shows what the
Eqn. 8-7
Eqn. 8-8
115
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