T48C862-R4 datasheet(35/107 Pages) ATMEL

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T48C862-R4 [Preliminary]

4551C–4BMCU–01/04

Port 2 Data Register (P2DAT)

Primary register address: "2"hex

* Bit 3 -> MSB, Bit 0 -> LSB

Port 2 Control Register (P2CR)

Auxiliary register address: "2"hex

Value: 1111b means all pins in input mode

Table 10.

Port 2 Control Register

Bi-directional Port 5

As all other bi-directional ports, this port includes a bitwise programmable Control Reg-

ister (P5CR), which allows the individual programming of each port bit as input or

output. It also opens up the possibility of reading the pin condition when in output mode.

This is a useful feature for self testing and for serial bus applications.

The port pins can also be used as external interrupt inputs (see Figure 30 on page 36

and Figure 31 on page 36). The interrupts (INT1 and INT6) can be masked or indepen-

dently configured to trigger on either edge. The interrupt configuration and port direction

is controlled by the Port 5 Control Register (P5CR). An additional low resistance pull-

up/pull-down transistor mask option provides an internal bus pull-up for serial bus

applications.

The Port 5 Data Register (P5DAT) is I/O mapped to the primary address register of

address "5"h and the Port 5 Control Register (P5CR) to the corresponding auxiliary

nibble and then the high nibble (see section “Addressing Peripherals” on page 30).

Bit 3 *

Bit 2

Bit 1

Bit 0

P2DAT3

P2DAT2

P2DAT1

P2DAT0

Reset value: 1111b

Bit 3Bit 2Bit 1Bit 0

P2CR3

P2CR2

P2CR1

P2CR0

Reset value: 1111b

Code

3 2 1 0

Function

x x x 1

BP20 in input mode

x x x 0

BP20 in output mode

x x 1 x

BP21 in input mode

x x 0 x

BP21 in output mode

x 1 x x

BP22 in input mode

x 0 x x

BP22 in output mode

1 x x x

BP23 in input mode

0 x x x

BP23 in output mode

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