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General Purpose Input/Output Labs
Special care should be observed when connecting the LED jumper wires to the
expansion headers surrounding the PIC16F690, as the PORTC pins are not in
sequential order. The 470 Ω resistors are used to limit the current across the LEDs to
manufacturer specifications. Furthermore, the PIC16F690 Data Sheet electrical
specifications (see Section 17.0) specify that each port pin should not source/sink more
than 25 mA. The maximum output current sourced/sunk by all port pins combined
should not exceed 200 mA. The 470 Ω resistors keep all source current well within
these specifications.
3.3.4
3.3.4.1
Lab 1: Light LEDs
NEW REGISTERS USED IN THIS LAB
To configure the peripherals used in this lab, the following registers are used:
1. PORTC Register: PORTC (Register 4-11 in Section 4 of the PIC16F690 Data
Sheet).
- 8-bit bidirectional port.
2. PORTC Tri-State Register: TRISC (Register 4-12 in Section 4 of the PIC16F690
Data Sheet).
- Configures corresponding bits in PORTC as either input or output.
3. Analog Select Register High and Analog Select Register Low: ANSELH and
ANSEL (Registers 4-4 and 4-3 in Section 4 of the PIC16F690 Data Sheet).
- Configure associated pins for analog or digital input signals.
3.3.4.2
OVERVIEW
This first lab demonstrates how to output data from the PORTC peripheral on the
PIC16F690 to its associated pins. LEDs connected to PORTC pins will light when the
associated pin is driven high (approx. V DD ) or turn the LED OFF when driven low
(approx. V SS ). The port peripherals will all default to input on start-up and will therefore
need to be configured as output using the TRISC register. Also, PORTC pins RC0,
RC1, RC2, RC3, RC6 and RC7 are configurable for both analog and digital signals. On
start-up, any analog/digital functional pin is defaulted to analog. Therefore, this
application will require that these pins be configured as digital by configuring the
associated bits in the ANSEL and ANSELH analog select registers.
FIGURE 3-2:
? 2009 Microchip Technology Inc.
MAIN() SOFTWARE CONTROL LOOP FLOWCHART FOR
LAB 1
main()
Initialize()
Loop Forever
Do_Outputs()
DS41369A-page 19
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