Datasheet

78
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
11.3.5 Alternate Functions of Port E
The Port E pins with alternate functions are shown in Table 11-12.
The alternate pin configuration is as follows:
• XTAL2/ADC0 – Bit 2
XTAL2: Chip clock Oscillator pin 2. Used as clock pin for crystal Oscillator or Low-frequency
crystal Oscillator. When used as a clock pin, the pin can not be used as an I/O pin.
ADC0, Analog to Digital Converter, input channel 0.
Table 11-11. Overriding Signals for Alternate Functions in PD3..PD0
Signal Name
PD3/TXD/OC0A/
SS/MOSI_A
PD2/PSCIN2/
OC1A/MISO_A
PD1/PSCIN0/
CLKO
PD0/PSCOUT00/X
CK/SS_A
PUOE
TXEN + SPE •
MSTR • SPIPS
–0
SPE •
MSTR • SPIPS
PUOV
TXEN
• SPE • MSTR
• SPIPS • PD3 • PUD
– 0 PD0 • PUD
DDOE
TXEN + SPE •
MSTR • SPIPS
–0
PSCen00 + SPE •
MSTR • SPIPS
DDOV TXEN 0 0 PSCen00
PVOE
TXEN + OC0en +
SPE •
MSTR • SPIPS
– 0 PSCen00 + UMSEL
PVOV
TXEN • TXD + TXEN
• (OC0en • OC0 +
OC0en
• SPIPS •
MOSI)
–0–
DIEOE 0 0 0 0
DIEOV 0 0 0 0
DI
SS
MOSI_Ain
SS_A
AIO
Table 11-12. Port E Pins Alternate Functions
Port Pin Alternate Function
PE2
XTAL2: XTAL Output
ADC0 (Analog Input Channel 0)
PE1
XTAL1: XTAL Input
OC0B (Timer 0 Output Compare B)
PE0
RESET# (Reset Input)
OCD (On Chip Debug I/O)