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| 型号： | LC89052T |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO24 |
| 封装： | 0.225 INCH, TSSOP-24 |
| 文件页数： | 17/42页 |
| 文件大小： | 482K |
| 代理商： | LC89052T |
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LC89052T
No.7457-24/42
8.7 User General Definable Output Port (
__________
UGPI )
__________
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
initial setting of this GPIDAT register is "1", so high level is output from the
__________
UGPI pin.
8.7.1 Microcontroller interface register output (Example of signals that control low power of optical module)
This section describes an example in which
__________
UGPI is used as a power supply control signal for an optical module as a
microcontroller interface register output.
(a) Connect the
__________
UGPI output to the power supply control switch of the optical module.
(b) After a reset due to
_____
PD, microcontroller interface register output is selected as the initial state of
__________
UGPI. As a result,
the default GPIDAT value is output.
(c) After a reset, the initial value of GPIDAT is set to "1", so H is output from
__________
UGPI. Therefore, after a reset, the
control switch is turned off, and data is not supplied from the optical module.
(d) The application must set GPIDAT to "0" to have the optical module supply data. That is, the
__________
UGPI output can be
controlled with GPIDAT, and the current drain can be minimized when the optical module is not used.
Figure 8.12
__________
UGPI Output Example (Power supply control signal for an optical module)
LC89052T
UGPI
RXIN
Optical receiver
module
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