LC89057W-VF4A-E Datasheet, PDF (35/59 Pages) Sanyo Semicon Device – Digital Audio Interface Transceiver

LC89057W-VF4A-E
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12. Microcontroller Interface ( INT , CL, CE, DI, DO)
12.1 Description of Micr_{_}o_{_}c_{_}o_{_} ntroller Interface
12.1.1 Interrupt output (INT)
• Interrupts are output when a change has occurred in the PLL lock status or output data information.
______
• _{Interrupt output consists of the register for selecting the interrupt source, the INT pin that outputs that state transition,}
and the registers that store the interrupt source data.
______
• _{Normally INT outputs "L" upon occurrence of an interrupt while "H" is output. Following "L" output, it returns to "H"}
according to the INTOPF setting.
• _{INTOPF determines whether to hold the "L" pulse for a certain period and then clear it ("H"), or to clear it at a time}
when the output register is read.
• The interrupt sources can be selected among the following items. Multiple sources can be selected at the same time
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with the contents of CCB address 0xE8 and command address 0x08. INT outputs OR calculation result of the selected
interrupt sources.
______
INT
output
=
(selected
source
1)
+
(selected
source
2)
+
...
+
(selected
source
n)
Table 12.1 Interrupt Source Setting Contents
No.
Command Name
Description
1
ERROR
Output when RERR pin status has changed
2
INDET
Output when input data pin status has changed (subject to oscillation amplifier operation condition)
3
FSCHG
Output when input fs calculation result has changed. (subject to oscillation amplifier condition)
4
CSRNW
Output when channel status data of first 48 bits have updated
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5
UNPCM
Output when AUDIO pin status has changed
6
PCRNW
Output when burst preamble Pc has been updated
7
SLIPO
Output when data is read twice during slave setting and missing data is detected
8
EMPF
Output when emphasis information has changed
• The contents of set interrupt source are saved in output registers DO8 to DO15 of CCB address 0xEA, when the
____________
source occurs. However, for the read registers for source items 1 and 5, the each status of the RERR and AUDIO pins
are output at the time of reading. Other data except for source items 1 and 5 are saved in the registers upon occurrence
of an interrupt source.
• _{Concerning source items 2 and 3, the oscillation amplifier clock is used. Therefore, if the status is monitored even}
while the PLL is locked, the oscillation amplifier must be set to the continuous operation mode.
______
• _{Clearing INT at the same time of readout of an output register is carried out immediately after the output register}
0xEA is set.
______
• _{The pulse width of the setting in which the INT output following the occurrence of an interrupt source is set to the "L"}
pulse output mode is somewhere between 1/2fs and 3/2fs for one interrupt source.
12.1.2 CCB format
• _{The various function settings as well as information writing and reading are performed with the microcontroller}
interface.
• _{The data format of the microcontroller interface conforms to Sanyo's original serial bus format (CCB), but three-state}
is employed instead of open-drain for the data output format.
• _{Data input/output is performed following CCB address input. For the data input/output timing, see the input/output}
timing chart.
Table 12.2 Relationship between Register I/O Contents and CCB Addresses
Register I/O contents
R/W
CCB address
B0
B1
B2
B3
A0
A1
A2
A3
Function setting data input
Write
0xE8
0
0
0
1
0
1
1
1
CS data input
Write
0xE9
1
0
0
1
0
1
1
1
Interrupt data output
Read
0xEA
0
1
0
1
0
1
1
1
fs data output
Read
0xEB
1
1
0
1
0
1
1
1
CS data output
Read
0xEC
0
0
1
1
0
1
1
1
Pc data output
Read
0xED
1
0
1
1
0
1
1
1
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