ATTINY13 datasheet(49/169 Pages) ATMEL

49 / 169 page

ATtiny13

2535B–AVR–01/04

MCU Control Register –

MCUCR

• Bits 7, 2– Res: Reserved Bits

These bits are reserved bits in the ATtiny13 and will always read as zero.

• Bit 6 – 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).

See “Configuring the Pin” on page 42 for more details about this feature.

Alternate Functions of Port B

The Port B pins with alternate function are shown in Table 21.

Notes:

1. Reset pin, debugWire I/O, ADC Input channel, or Pin Change Interrupt.

2. ADC Input channel or Pin Change Interrupt.

3. ADC Input channel, Clock Input, or Pin Change Interrupt.

4. Serial Clock Input, Timer/Counter Clock Input, ADC Input Channel 0, or Pin Change

Interrupt.

5. Serial Data Input, Analog Comparator Negative Input, Output Compare and PWM

Output B for Timer/Counter, External Interrupt 0 or Pin Change Interrupt.

6. Serial Data Output, Analog Comparator Positive Input, Output Compare and PWM

Output A for Timer/Counter, or Pin Change Interrupt.

Table 22 and Table 23 on page 50 relate the alternate functions of Port B to the overrid-

ing signals shown in Figure 24 on page 47.

Bit

–PUD

SM1

SM0

–

ISC01

ISC00

MCUCR

Read/Write

R/W

Initial Value

Table 21. Port B Pins Alternate Functions

Port Pin

Alternate Function

PB5

RESET/dW/ADC0/PCINT5(1)

PB4

ADC2/PCINT4(2)

PB3

ADC3/CLKI/PCINT3(3)

PB2

SCK/ADC1/T0/PCINT2(4)

PB1

MISO/AIN1/OC0B/INT0/PCINT1/RXD(5)

PB0

MOSI/AIN0/OC0A/PCINT0/TXD(6)

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