ATMEGA32A_14 Datasheet, PDF (61/336 Pages) ATMEL Corporation – 8-bit Microcontroller with 32KBytes In-System Programmable Flash

• OC1A – Port D, Bit 5
OC1A, Output Compare Match A output: The PD5 pin can serve as an external output for the Timer/Counter1 Out-
put Compare A. The pin has to be configured as an output (DDD5 set (one)) to serve this function. The OC1A pin
is also the output pin for the PWM mode timer function.
• OC1B – Port D, Bit 4
OC1B, Output Compare Match B output: The PD4 pin can serve as an external output for the Timer/Counter1 Out-
put Compare B. The pin has to be configured as an output (DDD4 set (one)) to serve this function. The OC1B pin
is also the output pin for the PWM mode timer function.
• INT1 – Port D, Bit 3
INT1, External Interrupt Source 1: The PD3 pin can serve as an external interrupt source.
• INT0 – Port D, Bit 2
INT0, External Interrupt Source 0: The PD2 pin can serve as an external interrupt source.
• TXD – Port D, Bit 1
TXD, Transmit Data (Data output pin for the USART). When the USART Transmitter is enabled, this pin is config-
ured as an output regardless of the value of DDD1.
• RXD – Port D, Bit 0
RXD, Receive Data (Data input pin for the USART). When the USART Receiver is enabled this pin is configured as
an input regardless of the value of DDD0. When the USART forces this pin to be an input, the pull-up can still be
controlled by the PORTD0 bit.
Table 12-13 and Table 12-14 relate the alternate functions of Port D to the overriding signals shown in Figure 12-5
on page 56.
Table 13-13. Overriding Signals for Alternate Functions PD7:PD4
Signal Name
PD7/OC2
PD6/ICP1
PD5/OC1A
PUOE
0
0
0
PUOV
0
0
0
DDOE
0
0
0
DDOV
0
0
0
PVOE
OC2 ENABLE
0
OC1A ENABLE
PVOV
OC2
0
OC1A
DIEOE
0
0
0
DIEOV
0
0
0
DI
–
ICP1 INPUT –
AIO
–
–
–
PD4/OC1B
0
0
0
0
OC1B ENABLE
OC1B
0
0
–
–
ATmega32A [DATASHEET] 61
Atmel-8155D-AVR-ATmega32A-Datasheet_02/2014