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<strong>UAC</strong> <strong>357xB</strong><br />
ADVANCE INFORMATION<br />
2.3. GPIO<br />
There are two groups of different types of GPIOs:<br />
– Input and output pins: GPIO[0…11]<br />
– Control pins: RD, STRB<br />
GPIO[11:8]<br />
GPIO[7:0]<br />
(Address is driven by <strong>UAC</strong> 355xB)<br />
Address<br />
(External device drives data lines)<br />
Data<br />
RD<br />
STRB<br />
83 ns 166 ns (typical)<br />
<strong>UAC</strong> <strong>357xB</strong> reads data here<br />
GPIO Address Mode: Read<br />
Fig. 2–2: <strong>UAC</strong> <strong>357xB</strong> parallel interface timing (read)<br />
GPIO[11:8]<br />
GPIO[7:0]<br />
(Address is driven by <strong>UAC</strong> 355xB)<br />
Address<br />
(<strong>UAC</strong> 355xB drives data lines)<br />
Data<br />
RD<br />
STRB<br />
83 ns 166 ns (typical)<br />
valid data<br />
GPIO Address Mode: Write<br />
Fig. 2–3: <strong>UAC</strong> <strong>357xB</strong> parallel interface timing (write)<br />
The port pins can also be set into different electrical<br />
states:<br />
– weak or strong driver strength<br />
– output or tristate<br />
– internal pull-down on or off<br />
There are two GPIO pins with special alternate functions<br />
(see Table 2–1)<br />
– GPIO[10] - Start Timer<br />
– GPIO[11] - PWM Output<br />
A description of these functions can be found in Section<br />
2.4. “General Purpose Timer” on page 10.<br />
8 Aug. 20, 2004; 6251-650-1AI Micronas
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