T48C862-R4 datasheet(38/107 Pages) ATMEL

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T48C862-R4 [Preliminary]

4551C–4BMCU–01/04

Port 4 Data Register (P4DAT)

Primary register address: "4"hex

Port 4 Control Register (P4CR)

Byte Write

Auxiliary register address: "4"hex

P4xM2, P4xM1 – Port 4x Interrupt mode/direction code

Table 12.

Port 4 Control Register

Bi-directional Port 6

The bi-directional Port 6 is a bitwise configurable I/O port and provides the external pins

for the Timer 3. As a normal port, it performs in exactly the same way as bi-directional

Port 6 (see Figure 32 on page 37). Two additional multiplexes allow data and port direc-

tion control to be passed over to other internal module (Timer 3). The I/O pin for T3I line

has an additional mode to generate a Timer 3 interrupt.

All two Port 6 pins can be individually switched by the P6CR register. Figure 32 on page

37 shows the internal interfaces to bi-directional Port 6.

Bit 3Bit 2Bit 1Bit 0

P4DAT3

P4DAT2

P4DAT1

P4DAT0

Reset value: 1111b

Bit 3Bit 2Bit 1Bit 0

First write cycle

P41M2

P41M1

P40M2

P40M1

Reset value: 1111b

Bit 7Bit 6Bit 5Bit 4

Second write cycle

P43M2

P43M1

P42M2

P42M1

Reset value: 1111b

Auxiliary Address: "4"hex

First Write Cycle

Second Write Cycle

Code

3 2 1 0

Function

Code

3 2 1 0

Function

x x 1 1

BP40 in input mode

x x 1 1

BP42 in input mode

x x 1 0

BP40 in output mode

x x 1 0

BP42 in output mode

x x 0 1

BP40 enable alternate function

(SC for SSI)

x x 0 x

BP42 enable alternate function

(T2O for Timer 2)

x x 0 0

BP40 enable alternate function

(falling edge interrupt input for

INT3)

1 1 x x

BP43 in input mode

1 1 x x

BP41 in input mode

1 0 x x

BP43 in output mode

1 0 x x

BP41 in output mode

0 1 x x

BP43 enable alternate function

(SD for SSI)

0 1 x x

BP41 enable alternate function

(VMI for voltage monitor input)

0 0 x x

BP43 enable alternate function

(falling edge interrupt input for

INT3)

0 0 x x

BP41 enable alternate function

(T2I external clock input for

Timer 2)

––

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