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T48C862-R8 Datasheet

  • T48C862-R8

  • MCU

  • Atmel   Atmel

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T48C862-R8
Port 2 Data Register (P2DAT)
Bit 3 *
P2DAT3
Bit 2
P2DAT2
Bit 1
P2DAT1
Bit 0
P2DAT0
Reset value: 1111b
Primary register address: "2"hex
* Bit 3 -> MSB, Bit 0 -> LSB
Port 2 Control Register (P2CR)
Bit 3
P2CR3
Bit 2
P2CR2
Bit 1
P2CR1
Bit 0
P2CR0
Auxiliary register address: "2"hex
Reset value: 1111b
Value: 1111b means all pins in input mode
Code
3210
xxx1
xxx0
xx1x
xx0x
x1xx
x0xx
1xxx
0xxx
Function
BP20 in input mode
BP20 in output mode
BP21 in input mode
BP21 in output mode
BP22 in input mode
BP22 in output mode
BP23 in input mode
BP23 in output mode
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 29 and Figure
30). The interrupts (INT1 and INT6) can be masked or independently configured to trig-
ger 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
register. The P5CR is a byte-wide register and is configured by writing first the low
nibble and then the high nibble (see section "Addressing Peripherals").
35
4590B鈥?BMCU鈥?2/03

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