參數(shù)資料
型號(hào)： HE84760B
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(yè)數(shù)： 25/51頁(yè)
文件大?。?/td> 487K
代理商： HE84760B
13.
General Purpose I/O
There are three dedicated general purpose I/O port, PRTC, PRTD and PRT10, while PRT15[1..0] and
KING BILLION ELECTRONICS CO., LTD
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HE84760B
HE80004 Series
June 29, 2005
This specification is subject to change without notice. Please contact sales person for the latest version before use.
25
V1.0
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
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.
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. The 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 PRT15 and PRT17 are shared with LCD segment driver, the function of the pad is determined
by mask options. Following table is the setting for MO_LIO[...] and MO_PP[...] and others related to
LCD display setting and pin assignment features.
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