FT901Q-R datasheet(31/67 Pages) BRIDGETEK

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FT900

/1/2/3 Revision C Embedded Microcontroller Datasheet

Version 1.0

Document No. BRT_000172 Clearance No.: BRT#087

4.18.1

Features



Configure camera registers via I2C two-wire interface.



8-bit data is clocked by an external clock provided by the camera module.



With VSYNC, HREF and PCLK control signals.



Programmable data capture trigger position.



2kB FIFO for camera capture data.

4.19

PWM

The FT900/1/2/3 series supports 7 separate independent PWM output channels. All channels share an 8-

bit pre-scaler to scale the system clock frequency to the desired channels.

Each channel has its own 16-bit comparator value. This is the value that would be matched to a preset

16-bit counter. When a channel’s 16-bit comparator value matches that of the 16-bit counter, the

corresponding PWM channel output will toggle. This 16-bit comparator value will continue to count until it

reaches its preset value, and the counter will just roll over.

A special feature allows the 7 channels each to also toggle its own output based on the comparison

results of other channels. Hence each channel potentially can have up to 8 toggle edges. The PWM signal

generated can be output as a single-shot or continuous output.

The PWM counter also supports an external trigger. There are 6 GPIOs selectable for an external trigger.

PWM channel 0 and channel 1 can double as a stereo 11.025 kHz or 22.050 kHz PCM audio channel. Once

this feature is setup, the 16-bit or 8-bit PCM audio data can be downloaded to the PWM local FIFO which

can hold up to 64 bytes stereo or 128 bytes mono audio data. The data is played back based on the pre-

scaler and 16-bit counter, and is automatically scaled to fit in the playback period if necessary.

The PWM FIFO can generate a number of interrupts to support PCM playback. They are FIFO empty, full,

half-full, overflow, and underflow. Each of these interrupts can be individually masked if required.

4.19.1

Features



Support 7 PWM output channels.



Support single-shot or continuous PWM data output.



Support external GPIO trigger.



Support 16-bit / 8-bit stereo PCM audio data output.



Control PCM FIFO full, empty, half-empty, overflow and underflow buffer management.



Support PCM volume control for audio playback.

4.20

SD host controller

The FT900/1/2/3 series contains one SD host controller offering access to external large capacity non-

volatile memory.

4.20.1

Features



Compliant with SD host controller standard specification, version 3.0.



Compliant with SD physical layer specification, version 3.0.Compliant with SDIO card

specification, version 2.0.



Compliant with MMC card specification, version 4.3.



Supports both streaming and non-streaming data transfers.



Supports configurable SD bus modes: 1-bit mode and 4-bit mode.



Support 4K SRAM for data FIFO.



Configurable CPRM function for security.



Built-in generation and check for 7-bit and 16-bit CRC data.



Card detection (Insertion/Removal).



Supports Read Wait mechanism for SDIO function.

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