FT900Q-R datasheet(52/67 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

FT900

RTC_XI/

RTC_CLKIN RTC_XIO

XTAL

CRTCL

32.768

KHz

Figure 6-3 - RTC 32.768 KHz oscillator connection

FT900

RTC_XI/

RTC_CLKIN RTC_XIO

32.768KHz

Figure 6-4 - External 32.768 KHz clock input

6.3

Standard I/O Pin Configuration

Figure 6-5 shows the possible pin modes for standard I/O pins with multiplex functions:



Output driver enabled



Output driver capability control



Output slew rate control



Open drain output



Input with pull-up enabled



Input with pull-down enabled



Input with keeper enabled



Input with Schmitt trigger

The default configuration for standard I/O pins is input with pull-down enabled except GPIO 0/1/2. All I/O

pins have ESD protection.

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