ml7084-001 Oki Semiconductor, ml7084-001 Datasheet - Page 197

• Manufacturer Part Number: ml7084-001
• Description: 4ch Voip Codec
• Manufacturer: Oki Semiconductor

Dial Pulse Detector 0 (DPDET0)
The dial pulse detector 0 can detect dial pulse signals input from the general-purpose input/output port GPIOB[0].
The dial pulse detector 0 is enabled when the DPDET0 activation control register (DPDET0_EN) is “1”, the
DPDET0 detection status register (DP0_DET) is set to “1” when a dial pulse signal is detected, and it is stored in the
DPDET0 detection dial pulse count display register (DPDET0_D[7:0]). Read the dial pulse count detected when
DP0_DET changes from “1” to “0” from DPDET0_D[7:0]. If a dial pulse signal is not detected, or DPDET0_EN is
“0”, DP0_DET is set to “0”.
Figure 55 shows the dial pulse detection timing.
The dial pulse detector samples dial pulse signals input from GPIOB[0] at every 4 kHz, and detects dial pulses
according to the setting values of the ON guard timer (DPDET0_ON_TIM) and the OFF guard timer
(DPDET0_OFF_TIM). It can adjust the detection end time by setting the detection end timer
(DPDET0_DETOFF_TIM).
A. DPDET0 activation control register (DPDET0_EN)
B. DPDET0 detection status register (DP0_DET)
OKI Semiconductor
This bit is set to “1” after DPDET0_EN has been set when an edge of a signal input from the GPIOB[0] pin is
detected. Further, if no edge is detected for a period set in DPDET0_DETOFF_TIM after an edge detection, this
bit will be cleared automatically to “0”.
0 : Stop (Initial value)
1 : Operate
0 : No dial pulse signal detected (Initial value)
1 : Dial pulse signal detected
Status of internal
DPDET0_DATA
- DP detection timing
- Status of internal detection by guard timer setting
DPDET0_EN
DP0_DET
GPIOB[0]
GPIOB[0]
detection
/DPI0
/DPI0
(Internal signal after masked by guard timer)
Figure 55 Dial Pulse Detection Timing
0
DPDET0_DETOFF_TIM
1
DPDET0_ON_TIM
2
3
DPDET0_OFF_TIM
DPDET0_DETOFF_TIM
1
FEDL7224-001FULL-01
0
ML7224-001TC
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