AT90PWM2(2005) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT90PWM2
(Rev.:2005)

8-bit Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

MCU Control Register –

MCUCR

Bit

7

6

SPIPS

–

Read/Write

R/W

R

Initial Value

0

0

5

4

3

2

1

0

–

PUD

–

–

IVSEL IVCE MCUCR

R

R/W

R

R

R/W

R/W

0

0

0

0

0

0

• 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

Alternate Functions of Port B The Port B pins with alternate functions are shown in Table 24.

Table 24. Port B Pins Alternate Functions

Port Pin

PB7

PB6

PB5

PB4

PB3

PB2

PB1

PB0

Alternate Functions

PSCOUT01 output

ADC4 (Analog Input Channel 4)

SCK (SPI Bus Serial Clock)

ADC7 (Analog Input Channel 7)

ICP1B (Timer 1 input capture alternate input)

PSCOUT11 output (see note 4)

ADC6 (Analog Input Channel 6)

INT2

AMP0+ (Analog Differential Amplifier 0 Input Channel )

AMP0- (Analog Differential Amplifier 0 Input Channel )

ADC5 (Analog Input Channel5 )

INT1

MOSI (SPI Master Out Slave In)

PSCOUT21 output

MISO (SPI Master In Slave Out)

PSCOUT20 output

The alternate pin configuration is as follows:

• PSCOUT01/ADC4/SCK – Bit 7

PSCOUT01: Output 1 of PSC 0.

ADC4, Analog to Digital Converter, input channel 4.

SCK: Master Clock output, Slave Clock input pin for SPI channel. When the SPI is

enabled as a slave, this pin is configured as an input regardless of the setting of DDB7.

When the SPI is enabled as a master, the data direction of this pin is controlled by

DDB7. When the pin is forced to be an input, the pull-up can still be controlled by the

PORTB7 bit.

• ADC7/ICP1B/PSCOUT11 – Bit 6

ADC7, Analog to Digital Converter, input channel 7.

ICP1B, Input Capture Pin: The PB6 pin can act as an Input Capture Pin for

Timer/Counter1.

70 AT90PWM2/3

4317B–AVR–02/05

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