lc89052t Sanyo Semiconductor Corporation, lc89052t Datasheet - Page 24

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

8.7 User General Definable Output Port (
8.7.1 Microcontroller interface register output (Example of signals that control low power of optical module)
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UGPI pin is a user-definable output port that can be selected for the following functions.
—Microcontroller interface register output
—Signal output during clock switching transitional period
Selection is done by GPISEL. The initial setting is set to the microcontroller interface register GPIDAT. However, the
This section describes an example in which
initial setting of this GPIDAT register is "1", so high level is output from the
microcontroller interface register output.
(a) Connect the
(b) After a reset due to
(c) After a reset, the initial value of GPIDAT is set to "1", so H is output from
(d) The application must set GPIDAT to "0" to have the optical module supply data. That is, the
the default GPIDAT value is output.
control switch is turned off, and data is not supplied from the optical module.
controlled with GPIDAT, and the current drain can be minimized when the optical module is not used.
Figure 8.12
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UGPI output to the power supply control switch of the optical module.
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PD, microcontroller interface register output is selected as the initial state of
LC89052T
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UGPI Output Example (Power supply control signal for an optical module)
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UGPI is used as a power supply control signal for an optical module as a
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UGPI )
UGPI
RXIN
LC89052T
Optical receiver
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UGPI pin.
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UGPI . Therefore, after a reset, the
module
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UGPI output can be
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UGPI . As a result,
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