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| 型號(hào)： | OMAP5910(DSP) |
| 英文描述： | Dual-Core Processor |
| 中文描述： | 雙核處理器 |
| 文件頁(yè)數(shù)： | 59/160頁(yè) |
| 文件大?。?/td> | 1997K |
| 代理商： | OMAP5910(DSP) |
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Functional Overview
47
August 2002 Revised August 2003
SPRS197B
3.6.7 HDQ/1-Wire Interface
This module allows implementation of both HDQ and the 1-Wire protocols. These protocols use a single wire
to communicate between a master and a slave. The HDQ/1-Wire pin is open-drain and requires an external
pullup resistor.
HDQ and 1-Wire interfaces can be found on commercially available battery management and power
management devices. The interface can be used to send command and status information between
OMAP5910 and such a battery or power management device.
3.6.8 Camera Interface
The camera interface is an 8-bit external port which may be used to accept data from an external camera
sensor. The interface handles multiple image formats synchronized on vertical and horizontal synchronization
signals. Data transfer to the camera interface may be done synchronously or asynchronously.
The camera interface module converts the 8-bit data transfers into 32-bit words and utilizes a 128-word buffer
to facilitate efficient data transfer to memory. Data may be transferred from the camera interface buffer to
internal memory by the system DMA controller or directly by the MPU. The interface may utilize an externally
driven clock at rates up to 13 MHz or may optionally provide an output reference clock at rates of 8 MHz,
9.6 MHz, or 24 MHz when the camera interface is configured for clocking from the internal 48 MHz. When the
camera interface is configured to obtain clocking from the base oscillator frequency (12 MHz or 13 MHz), the
camera interface clock is configurable to operate at the base frequency or one half the base frequency (6 MHz
or 6.5 MHz).
3.6.9 MPUIO/Keyboard Interface
The MPUIO pins may be used as either general-purpose I/O for the MPU or as a Keyboard Interface to a 6 x 5
or 8 x 8 keypad array. If a 6 x 5 keypad array is implemented, the unused MPUIO pins may be used as GPIO.
When used as GPIO, each pin may be configured individually as either an output or an input, and they may
be individually configured to generate MPU interrupts based on a level change (falling or rising) after a
debouncing process. These MPUIO interrupts may be used to wake up the device from deep-sleep mode
using the 32-kHz clock.
The MPUIO pins may also be used as a keyboard interface. The keyboard interface provides the following
pins:
KB.R[7:0] input pins for row lines
KB.C[7:0] output pins for column lines
To allow key-press detection, all input pins (KB.Rx) are pulled up to DV
DD
and all output pins (KB.Cx) are driven
low level. The KB.R[7:0] and KB.C[7:0] pins should be connected to an external keyboard matrix such that
when a key on the matrix is pressed, the corresponding row and column lines are shorted together. Any action
on a key generates an interrupt to the MPU, which then scans the column lines in a particular sequence to
determine which key or keys have been pressed.
3.6.10
Pulse-Width Light (PWL)
The Pulse-Width Light (PWL) module provides control of the LCD or keypad backlighting by employing a
random sequence generator. This voltage-level control technique decreases the spectral power at the
modulator harmonic frequencies. The module uses a switchable 32-kHz clock.
3.6.11
Pulse-Width Tone (PWT)
The Pulse-Width Tone (PWT) module generates a modulated frequency signal for use with an external buzzer.
The frequency is programmable between 349 Hz and 5276 Hz with 12 half-tone frequencies per octave. The
volume level of the output is also programmable.
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