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| 型號(hào)： | HE83R540(S) |
| 文件頁(yè)數(shù)： | 8/16頁(yè) |
| 文件大?。?/td> | 312K |
| 代理商： | HE83R540(S) |
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King Billion Electronics Co., Ltd
駿
億
電
子
股
份
有
限
公
司
HE83R123
HE80000 Series
8.
General Purpose I/O
There is one dedicated general purpose I/O port PRTD. All the I/O Ports are bi-directional and of
April 28, 2003
This specification is subject to change without notice. Please contact sales person for the latest version before use.
8
V1.0E
non-tri-state output structure. The output has weak sourcing (50
μ
A) and stronger sinking (1 mA)
capability and each can be configured as push-pull or open-drain output structure individually by mask
option. The input port has built-in Schmidt trigger to prevent it from chattering. The hysteresis level of
Schmidt trigger is 1/3 VDD.
MO_DPP[7..0]
0
1
Output Structure
Open-drain output
Push-pull output
When the I/O port is used as input, the weakly high sourcing PMOS can be used as pull-up. Open drain
can be used if the pull-up is not required and let the external driver to drive the pin. Please note that a
floating pad could cause more power consumption since the noise could interfere with the circuit and
cause the input to toggle. A ‘1’ needs to be written to port first before reading the input data from the I/O
pin, otherwise, the pin will always be stuck at ‘0’. If the PMOS is used as pull-up, care should be taken to
avoid the constant power drain by DC path between pull-up and external circuit.
VDD
VDD
Q
Q'
LATCH
MO_PP
SCHMIDT Trigger input
DOUT
PAD
DIN
PRT11[7..0], PRT14[7..0], PRT15[7..0] and PRT17[7..0] share pads with SEG[8..39]. The function of the
pins is selected by mask option MO_LIO11, MO_LIO14, MO_LIO15, MO_LIO17 respectively as shown
in the following figure.
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