HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 811

• Manufacturer Part Number: HD6417320
• Description: Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

(2)
As the figure 22.3 shows, the ringing signal from the line is transformed to rectangular wave and
then input to AFEIF. The interrupt is generated at the falling edge of input wave in AFEIF
module.
(3)
Dial pulse interrupt is generated in the dial pulse transmit sequence when AFEIF reads 0H (end)
data from DPNQ register or all of 4 digits are output. Refer to section 22.4.3, DAA Interface about
dial pulse sequence.
(4)
Interrupt is generated as is shown in figure 22.4. That is, AFEIFI signal is generated by
performing OR operation on the four signals from ASTR1 in FIFO interrupt control and the two
signals from ASTR2 in DAA interrupt control, and then sent out to INTC as one interrupt signal.
Dial Pulse Interrupt Timing
Interrupt Generator Circuit
Ringing Interrupt Timing
Interrupt occur
Ringing wave
ASTR1
(FIFO control)
ASTR2
(DAA control)
Input wave
Figure 22.3
Interrupt mask Interrupt factor
Interrupt mask Interrupt factor
Figure 22.4
2
4
Ringing Interrupt Occurrence Timing
2
4
Interrupt Generator
Section 22
Rev. 3.00 Jan. 18, 2008 Page 749 of 1458
4
2
Analog Front End Interface (AFEIF)
AFEIFI
REJ09B0033-0300