68HC705RC17 datasheet(79/126 Pages) FREESCALE

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Carrier Modulator Transmitter (CMT)

Modulator

MC68HC705RC17 — Rev. 2.0

General Release Specification

Carrier Modulator Transmitter (CMT)

EIMSK — External Interrupt Mask

1 = IRQ and keyscan interrupts masked

0 = IRQ and keyscan interrupts enabled

The external interrupt mask bit is used to mask IRQ and keyscan

interrupts. This bit is cleared by reset.

EXSPC — Extended Space Enable

1 = Extended space enabled

0 = Extended space disabled

For a description of the extended space enable bit, see 9.5.3

Extended Space Operation. This bit is cleared by reset.

BASE — Baseband Enable

1 = Baseband enabled

0 = Baseband disabled

When set, the BASE bit disables the carrier generator and forces the

carrier output high for generation of baseband protocols. When BASE

is clear, the carrier generator is enabled and the carrier output toggles

at the frequency determined by values stored in the carrier data

registers. See 9.5.1 Time Mode. This bit is cleared by reset. This bit

is not double buffered and should not be written to during a

transmission.

MODE — Mode Select

1 = CMT operates in FSK mode.

0 = CMT operates in time mode.

For a description of CMT operation in time mode, see 9.5.1 Time

Mode. For a description of CMT operation in FSK mode, see 9.5.2

FSK Mode. This bit is cleared by reset. This bit is not double buffered

and should not be written to during a transmission.

IE — Interrupt Enable

1 = CPU interrupt enabled

0 = CPU interrupt disabled

A CPU interrupt will be requested when EOC is set if IE was previously

set. If IE is clear, EOC will not request a CPU interrupt.

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68HC705RC17 데이터시트(PDF) 79 Page - Freescale Semiconductor, Inc