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I/O PORTS
S3F84Q5_UM_REV1.00
PORT 3
Port 3 is a 7-bit I/O Port that you can use two ways:
•
General-purpose I/O
•
Alternative function
Port 3 is accessed directly by writing or reading the port 3 data register, P3 at location E3H, Set1 Bank0.
Port 3 Control / Interrupt Control Register (P3CON)
Port 3 pins are configured individually by bit-pair settings in two control registers located: P3CONL (EDH, Set1
Bank0) and P3CONH (ECH, Set1 Bank0).
When you select output mode, a push-pull or an open-drain circuit is configured. In input mode, many different
selections are available:
•
Input mode.
•
Output mode(Push-pull or Open-drain)
•
Alternative function: External Interrupt − INT2–INT8 (falling edge)
•
Alternative function: SIO module − SI/SO/SCK
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