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T48C862-R8 Datasheet

  • T48C862-R8

  • MCU

  • Atmel   Atmel

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Figure 27.
Bi-directional Port 1
V DD
I/O Bus
*
(Data out)
D
Q
Static
pull-up
*
Switched
pull-up
P1DATy
R
Reset
(Direction)
OUT
S
IN
R
Master reset
NQ
Q
*) Configurable
BP1y
*
V DD
*
Static
pull-down
Switched
pull-down
Bi-directional Port 2
As all other bi-directional ports, this port includes a bitwise programmable Control Reg-
ister (P2CR), which enables 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.
Port 2, however, has an increased drive capability and an additional low resistance
pull-up/pull-down transistor mask option.
Care should be taken connecting external components to BP20/NTE. During any reset
phase, the BP20/NTE input is driven towards V
DD
by an additional internal strong pull-up
transistor. This pin must not be pulled down (active or passive) to V
SS
during reset by
any external circuitry representing a resistor of less than 150 kW. This prevents the cir-
cuit from unintended switching to test mode enable through the application circuitry at
pin BP20/NTE. Resistors less than 150 kW might lead to an undefined state of the inter-
nal test logic thus disabling the application firmware.
To avoid any conflict with the optional internal pull-down transistors, BP20 handles the
pull-down options in a different way than all other ports. BP20 is the only port that
switches off the pull-down transistors during reset.
Figure 28.
Bi-directional Port 2
V
I/O Bus
Switched
pull-up
DD
Static
Pull-up
*
(Data out)
I/O Bus
D
S
Master reset
I/O Bus
Q
P2DATy
*
*
BP2y
*
V
DD
D S Q
P2CRy
*
*
Static
Pull-down
(Direction)
*
Configurable
Switched
pull-down
34
T48C862-R8
4590B鈥?BMCU鈥?2/03

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