ATmega16M1 datasheet(69/365 Pages) ATMEL

69 / 365 page

7647F–AVR–04/09

ATmega16/32/64/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

SPIPS

–

–PUD

–

IVSEL

IVCE

MCUCR

Read/Write

R/W

Initial Value

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)

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