Datasheet

Data Sheet ADuC7060/ADuC7061
Rev. D | Page 101 of 108
GENERAL-PURPOSE I/O
The ADuC706x features up to 16 general-purpose bidirectional
input/output (GPIO) pins. In general, many of the GPIO pins have
multiple functions that are configurable by user code. By default,
the GPIO pins are configured in GPIO mode. All GPIO pins have
an internal pull-up resistor with a drive capability of 1.6 mA.
All I/O pins are 3.3 V tolerant, meaning that the GPIOs support
an input voltage of 3.3 V.
When the ADuC706x enters power-saving mode, the GPIO
pins retain their state.
The GPIO pins are grouped into three port buses.
Table 110 lists all the GPIO pins and their alternative functions.
A GPIO pin alternative function can be selected by writing to
the correct bits of the GPxCON register.
Table 110. GPIO Multifunction Pin Descriptions
Port
Configuration via GPxCON Including GP0CON0
Pin Mnemonic 00 01
0 P0.0/
SS
GPIO
SS
(SPI slave select).
P0.1/SCLK/SCL GPIO SCLK/SCL (serial clock/SPI clock).
P0.2/MISO GPIO MISO (SPI—master in/slave out).
P0.3/MOSI/SDA GPIO MOSI (SPI—master out/slave in).
P0.4/IRQ0/PWM1 GPIO/IRQ0 PWM1 (PWM Output 1).
P0.5/CTS GPIO CTS. UART clear to send pin.
P0.6/RTS GPIO RTS. UART request to send pin.
1 P1.0/IRQ1/SIN/T0 GPIO/IRQ1 SIN (serial input).
P1.1/SOUT GPIO SOUT (serial output).
P1.2/SYNC GPIO PWM sync (PWM sync input pin).
P1.3/TRIP GPIO PWM trip (PWM trip input pin).
P1.4/PWM2
GPIO
PWM2 (PWM Output 2).
P1.5/PWM3 GPIO PWM3 (PWM Output 3).
P1.6/PWM4 GPIO PWM4 (PWM Output 4).
2
P2.0/IRQ2/PWM0/EXTCLK
GPIO/IRQ2/EXTCLK
PWM0 (PWM Output 0).
P2.1/IRQ3/PWM5 GPIO/IRQ3 PWM5 (PWM Output 5).
GPxCON REGISTERS
GPxCON are the Port x (where x is 0, 1, or 2) control registers, which select the function of each pin of Port x as described in Table 112.
Table 111. GPxCON Registers
Name Address Default Value Access
GP0CON0 0xFFFF0D00 0x00000000 R/W
GP1CON 0xFFFF0D04 0x00000000 R/W
GP2CON 0xFFFF0D08 0x00000000 R/W