lc89052t Sanyo Semiconductor Corporation, lc89052t Datasheet - Page 27

• Manufacturer Part Number: lc89052t
• Description: Digital Audio Interface Receiver
• Manufacturer: Sanyo Semiconductor Corporation

9 Microcontroller Interface (E/INT, CE, CL, DI, DO)
9.1 Interrupt Output (E/INT)
Channel status and preamble B
Sub-code Q data
The E/INT pin can be set to function as the microcontroller interface interrupt output by setting INTSEL.
An interrupt output is issued when a change occurs in the PLL lock state or output data information.
The interrupt output consists of registers for selecting interrupts, the E/INT pin, which outputs those state transitions,
The E/INT pin normally is at the low level, and goes to the high level when an interrupt occurs. After going to high
INTOPF determines whether the E/INT pin holds the high pulse for a certain period and is then cleared (returning to
The interrupts can be selected from the sources listed below. More than one items can be set as interrupt sources at the
The contents of the set interrupt source are stored in output registers DO1 to DO7 at CCB address 0xEB when an
To monitor interrupt source item 5 in the PLL locked state, the oscillator amplifier must be set to continuous operation
When the LC89052T is set to the mode in which a H pulse is output from E/INT when an interrupt source occurs, the
The action to clear the E/INT pin output simultaneously with the reading of the output registers following the
and registers that store interrupt related data.
level, it returns to low level according to the INTOPF setting.
low), or the E/INT pin is cleared at the same time as the output register is read.
same time by setting the contents of CCB address 0xEA. The interrupt signal is issued whenever any one of the
interrupt sources arises.
interrupt source arises. However, the registers read for source items 1 through 4 output the current state of those
sources regardless of the E/INT output. For source items 5 through 7, the states are stored when an interrupt source
arises.
mode, since the oscillator amplifier clock is used.
pulse width of each interrupt source is somewhere between 1/2 fs and 3/2 fs.
occurrence of an interrupt is carried out immediately after the output registers at 0xEB are set up. Since, however, the
data associated with interrupt sources 6 and 7 is updated at the intervals listed below, it must be read promptly
whenever the corresponding interrupt sources are detected.
No.
1
2
3
4
5
6
7
E/INT output = (selected interrupt 1) + (selected interrupt 2) + ... + (selected interrupt n)
Command
INTPCM
INTERR
INTEMP
INTFSC
INTCSF
INTSQY
INTVFL
Data
Output when the state of the ERROR pin changes.
Output when the state of the
Output when the state of the pre-emphasis information changes.
Output when the state of the validity flag changes.
Output when the input fs calculation result changes.
Output when the first 48 bits of the channel status data are updated.
Output when the sub-code Q data can be read out.
Table 9.2 Data Update Intervals (Input fs = 32k to 96kHz)
Table 9.1 Interrupt Source Settings
13.3ms (fs = 44.1kHz), 6.65ms (2x speed)
2ms to 6ms
______
AUDIO pin changes.
LC89052T
Description
Update interval
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