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| 型號： | HE85750 |
| 廠商： | King Billion Electronics Co., Ltd. |
| 英文描述： | 8-bit Micro-controller |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 11/23頁 |
| 文件大?。?/td> | 399K |
| 代理商： | HE85750 |
King Billion Electronics Co., Ltd
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HE85750
HE80000 SERIES
9.
General Purpose I/O
There are two dedicated general purpose I/O port, PRTC[7..4] and PRTD, while PRT14, PRT15 and
2003/7/30
This specification is subject to change without notice. Please contact sales person for the latest version before use.
11
V1.52E
PRT17 are multiplexed with LCD segment driver pins. All the I/O ports are bi-directional and of non-
tri-state output structure. The output has weak sourcing (50 μA) and stronger sinking (1 mA) capability
and each can be configured as push-pull or open-drain output structure individually by mask option.
When the I/O port is used as input, the weakly high sourcing can be used as weakly 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. 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.
The input port has built-in Schmidt trigger to prevent it from chattering. Hysteresis level of Schmidt
trigger is 1/3*VDD.
VDD
VDD
Q
Q'
LATCH
MO_PP
SCHMIDT Trigger input
DOUT
PAD
DIN
As pads of PRT14, PRT15 and PRT17 are shared with LCD segment driver, the function of the pads is
determined by mask options.
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