Rainbow-electronics ATmega8HVD Manuel d'utilisateur télécharger pdf (Page 70)

70

8052B–AVR–09/08

ATmega4HVD/8HVD

14.4 Register Description

14.4.1 MCUCR – MCU Control Register

• 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). See

”Configuring the Pin” on page 62 for more details about this feature.

14.4.2 PORTB – Port B Data Register

14.4.3 DDRB – Port B Data Direction Register

14.4.4 PINB – Port B Input Pins Address

Bit 7 6 5 4 3 2 1 0

– – CKOE PUD – – – – MCUCR

Read/Write R R R/W R/W R R R R

Initial Value 0 0 0 0 0 0 0 0

Bit 76543210

-----PORTB2PORTB1PORTB0PORTB

Read/WriteRRRRRR/WR/WR/W

Initial Value00000000

Bit 76543210

----

- DDB2 DDB1 DDB0 DDRB

Read/WriteRRRRRR/WR/WR/W

Initial Value00000000

Bit 76543210

----

- PINB2 PINB1 PINB0 PINB

Read/WriteRRRRRRRR

Initial Value N/A N/A N/A N/A N/A N/A N/A N/A

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 167 168

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