Rainbow-electronics ATmega163L Instrukcja Użytkownika Pobierz pdf (Strona 100)

ATmega163(L)

100

n: 7,6…0, pin number.

PORT A Schematics

Note that all port pins are synchronized. The synchronization latches are not shown in the figure.

Figure 63. PORTA Schematic Diagrams (Pins PA0 - PA7)

Port B

Port B is an 8-bit bi-directional I/O port with internal pull-ups.

Three I/O memory address locations are allocated for Port B, one each for the Data Register - PORTB, $18($38), Data

Direction Register - DDRB, $17($37) and the Port B Input Pins - PINB, $16($36). The Port B Input Pins address is read

only, while the Data Register and the Data Direction Register are read/write.

All port pins have individually selectable pull-up resistors. The Port B output buffers can sink 20mA and thus drive LED dis-

plays directly. When pins PB0 to PB7 are used as inputs and are externally pulled low, they will source current if the

internal pull-up resistors are activated.

Table 43. DDAn Effects on PORTA Pins

DDAn PORTAn PUD I/O Pull Up Comment

0 0 x Input No Tri-state (Hi-Z)

0 1 1 Input No Tri-state (Hi-Z)

0 1 0 Input Yes PAn will source current if ext. pulled low.

1 0 x Output No Push-pull Zero Output

1 1 x Output No Push-pull One Output

DATA BUS

RESET

MOS

PULL-

PDn

ADCn

TO ADC MUX

WP:

WD:

RL:

RP:

RD:

WRITE PORTA

WRITE DDRA

READ PORTA LATCH

READ PORTA PIN

READ DDRA

0-7

DDAn

PORTAn

PWRDN

PUD

PUD: PULL-UP DISABLE

1 2 ... 95 96 97 98 99 100 101 102 103 104 105 ... 155 156

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