Rainbow Electronics ATmega64C1 - Manual (Page 67)

67
7647A–AVR–02/08
ATmega32/64/M1/C1
9.3.1 MCU Control Register – MCUCR
• Bit 4 – PUD: Pull-up Disable
When this bit is written to one, the pull-ups in the I/O ports are disabled even if the DDxn and
PORTxn Registers are configured to enable the pull-ups ({DDxn, PORTxn} = 0b01). Se
9.3.2 Alternate Functions of Port B
The Port B pins with alternate functions are shown in Table 9-3 .
The alternate pin configuration is as follows:
• ADC4/PSCOUT0B/SCK/PCINT7 – Bit 7
PSCOUT0B, Output 0B of PSC.
Bit 7 6 5 4 3 2 1 0
SPIPS – – PUD – – IVSEL IVCE MCUCR
Read/Write R/W R R R/W R R R/W R/W
Initial Value 0 0 0 0 0 0 0 0
Table 9-3. Port B Pins Alternate Functions
Port Pin Alternate Functions
PB7
PSCOUT0B (PSC output 0B)
ADC4 (Analog Input Channel 4)
SCK (SPI Bus Serial Clock)
PCINT7 (Pin Change Interrupt 7)
PB6
ADC7 (Analog Input Channel 7)
PSCOUT1B (PSC output 1B)
PCINT6 (Pin Change Interrupt 6)
PB5
ADC6 (Analog Input Channel 6)
INT2 (External Interrupt 2)
ACMPN1 (Analog Comparator 1 Negative Input)
AMP2- (Analog Differential Amplicator 2 Negative Input)
PCINT5 (Pin Change Interrupt 5)
PB4
AMP0+ (Analog Differential Amplifier 0 Positive Input)
PCINT4 (Pin Change Interrupt 4)
PB3
AMP0- (Analog Differential Amplifier 0 Negative Input)
PCINT3 (Pin Change Interrupt 3)
PB2
ADC5 (Analog Input Channel5 )
INT1 (External Interrupt 1)
ACMPN0 (Analog Comparator 0 Negative Input)
PCINT2 (Pin Change Interrupt 2)
PB1
MOSI (SPI Master Out Slave In)
PSCOUT2B (PSC output 2B)
PCINT1 (Pin Change Interrupt 1)
PB0
MISO (SPI Master In Slave Out)
PSCOUT2A (PSC output 2A)
PCINT0 (Pin Change Interrupt 0)