MC68HC05RC8 Datasheet, PDF (75/122 Pages) Freescale Semiconductor, Inc – General Release Specification

Freescale Semiconductor, Inc.
Carrier Modulator Transmitter (CMT)
Modulator
The modulator can operate in two modes, time or FSK. In time mode the
modulator counts clocks derived from the system oscillator and
modulates a single-carrier frequency or no carrier (baseband). In FSK
mode, the modulator counts carrier periods and instructs the carrier
generator to alternate between two carrier frequencies whenever a
modulation period (mark + space counts) expires.
12 BITS
0
MBUFF
13-BIT DOWN COUNTER *
12
=?
12
SREG *
CLOCK CONTROL
8
f_OSC
. CARRIER OUT
LOAD M_.BUFF/SBUFF
MODULATOR GATE
MODULATOR
OUT
SYSTEM CONTROL
PRIMARY/SECONDARY SELECT
MODULATOR/
CARRIER GENERATOR.
ENABLE
SBUFF
12 BITS
* DENOTES HIDDEN REGISTER
MODULATOR
CONTROL/STATUS REGISTER
EOC FLAG
EOC INTERRUPT ENABLE
MODE
BASE
DIV2
Figure 9-7. Modulator Block Diagram
MC68HC05RC16 — Rev. 3.0
General Release Specification
Carrier Modulator Transmitter (CMT)
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