HD6433636SW datasheet(291/418 Pages) RENESAS

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11.2

11.2.1

DTMF Control Register (DTCR)

Bit

76543210

DTEN

—

CLOE

RWOE

CLF1

CLF0

RWF1

RWF0

Initial value

01000000

Read/Write

R/W

—

R/W

DTCR is an 8-bit read/write register that enables the DTMF generator, enables row and column

output, and selects the output frequencies.

Upon reset, DTCR is initialized to H'40.

Bit 7—DTMF Generator Enable (DTEN): Bit 7 enables or disables operation of the DTMF

generator.

Bit 7: DTEN

Description

DTMF generator is halted

(initial value)

DTMF generator operates

Bit 6—Reserved Bit: Bit 6 is reserved: it is always read as 1, and cannot be modified.

Bit 5—Column Output Enable (CLOE): Bit 5 enables or disables DTMF column signal output.

Bit 5: CLOE

Description

DTMF column signal output is disabled (high-impedance)

(initial value)

DTMF column signal output is enabled

Bit 4—Row Output Enable (RWOE): Bit 4 enables or disables DTMF row signal output.

Bit 4: RWOE

Description

DTMF row signal output is disabled (high-impedance)

(initial value)

DTMF row signal output is enabled

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