ml7074a-004 Oki Semiconductor, ml7074a-004 Datasheet - Page 19

• Manufacturer Part Number: ml7074a-004
• Description: Voip Codec
• Manufacturer: Oki Semiconductor

These are input pins for testing purposes only. Keep the inputs to these pins at the “0” level during normal use
This is the interrupt request output pin. An “L” level is output for a duration of about 1.0 µs at this pin when there
This output will be maintained at the “H” level when there is no change in state of any of the interrupt causes. The
• Underflow error (CR3-B0)
• Overrun error (CR3-B1)
• When a dial pulse is detected (CR4-B6).
• When a DTMF signal is detected (CR4-B4).
• When DTMF_CODEC0, 1, 2, 3 are detected (CR4-B0, B1, B2, B3).
• When TONE0 is detected (CR3-B3).
• When TONE1 is detected (CR3-B4).
• When DSP_ERR is detected (CR3-B7).
• When FGEN_FLAG is cleared (CR5-B0).
conditions.
is a change in state of an interrupt cause.
actual interrupt cause generating the interrupt can be verified by reading CR3, CR4, and CR5. The different
interrupt causes are described below.
TST0, TST1, TST2, TST3
INTB
OKI Semiconductor
An interrupt is generated when a 2100 Hz tone signal is detected.
An interrupt is generated when there is a change to the non-detection condition in the tone signal detection
condition.
An interrupt is generated when any error occurs in the DSP inside the LSI.
FGEN_FLAG is cleared to “0” and an interrupt is generated when data settings are enabled to output data setting
register FGEN_D[7:0] (CR18) in the FSK generator.
An interrupt is generated when an internal read from the receive buffer occurs before the writing into the receive
buffer from the MCU has been completed.
An interrupt is generated when a normal writing is made in the receive buffer by the MCU and the underflow
error is released.
An interrupt is generated when an internal write of the next data into the transmit buffer occurs before the
transmit buffer data read out from the MCU has been completed.
An interrupt is generated when a normal read out is made from the transmit buffer by the MCU and the overrun
error is released.
An interrupt is generated when a DTMF signal is detected.
An interrupt is generated when there is a change from the DTMF signal detected state to the no-detected state.
An interrupt is generated when there is a change in the detected code (CR4-B0, B1, B2, B3) in the condition in
which a DTMF signal is being detected.
An interrupt is generated when a 1650 Hz tone signal is detected.
An interrupt is generated when there is a change to the non-detection condition in the tone signal detection
condition.
FEDL7074-003DIGEST-01
ML7074-004GA
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