AT90LS4433-4PC datasheet(77/126 Pages) ATMEL

77 / 126 page

AT90S/LS4433

1042H–AVR–04/03

Figure 55. Port B Schematic Diagram (Pin PB5)

Port C

Port C is a 6-bit bi-directional I/O port.

Three I/O memory address locations are allocated for the Port C, one each for the Data

C Input Pins – PINC, $13($33). The Port C 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 C output buffers can

sink 20 mA and thus drive LED displays directly. When pins PC0 to PC5 are used as

inputs and are externally pulled low, they will source current if the internal pull-up resis-

tors are activated.

Port C has an alternate function as analog inputs for the ADC. If some Port C pins are

configured as outputs, it is essential that these do not switch when a conversion is in

progress. This might corrupt the result of the conversion.

During Power-down mode, the Schmitt triggers of the digital inputs are disconnected.

This allows an analog voltage close to V

CC/2 to be present during Power-down without

causing excessive power consumption.

RESET

MOS

PULL-

PB5

WP:

WD:

RL:

RP:

RD:

SPE:

MSTR

WRITE PORTB

WRITE DDRB

READ PORTB LATCH

READ PORTB PIN

READ DDRB

SPI ENABLE

MASTER SELECT

DDB5

PORTB5

SPE

MSTR

SPI CLOCK

OUT

SPI CLOCK

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