Rainbow Electronics ATmega32L - Manual (Page 60)

60
ATmega32(L)
2503C–AVR–10/02
Note: 1. When enabled, the Two-wire Serial Interface enables slew-rate controls on the output
pins PC0 and PC1. This is not shown in the figure. In addition, spike filters are con-
nected between the AIO outputs shown in the port figure and the digital logic of the
TWI module.
Alternate Functions of Port D The Port D pins with alternate functions are shown in Table 31.
The alternate pin configuration is as follows:
• OC2 – Port D, Bit 7
OC2, Timer/Counter2 Output Compare Match output: The PD7 pin can serve as an
external output for the Timer/Counter2 Output Compare. The pin has to be configured
as an output (DDD7 set (one)) to serve this function. The OC2 pin is also the output pin
for the PWM mode timer function.
• ICP – Port D, Bit 6
ICP – In pu t Ca ptu re Pin: The PD 6 p in can a ct as an Inp ut Cap ture pin for
Timer/Counter1.
Table 30. Overriding Signals for Alternate Functions in PC3..PC0 (1)
Signal
Name
PC3/TMS PC2/TCK PC1/SDA PC0/SCL
PUOE JTAGEN JTAGEN TWEN TWEN
PUOV 1 1 PORTC1 • PUD PORTC0 • PUD
DDOE JTAGEN JTAGEN TWEN TWEN
DDOV 0 0 SDA_OUT SCL_OUT
PVOE 0 0 TWEN TWEN
PVOV 0 0 0 0
DIEOE JTAGEN JTAGEN 0 0
DIEOV 0 0 0 0
DI – – – –
AIO TMS TCK SDA INPUT SCL INPUT
Table 31. Port D Pins Alternate Functions
Port Pin Alternate Function
PD7 OC2 (Timer/Counter2 Output Compare Match Output)
PD6 ICP (Timer/Counter1 Input Capture Pin)
PD5 OC1A (Timer/Counter1 Output Compare A Match Output)
PD4 OC1B (Timer/Counter1 Output Compare B Match Output)
PD3 INT1 (External Interrupt 1 Input)
PD2 INT0 (External Interrupt 0 Input)
PD1 TXD (USART Output Pin)
PD0 RXD (USART Input Pin)