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| 型號(hào)： | HE84G762(S) |
| 文件頁數(shù)： | 28/52頁 |
| 文件大?。?/td> | 631K |
| 代理商： | HE84G762(S) |
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tri-state output structure. The output has weak sourcing (50
μ
A) and stronger sinking (1 mA) capability
KING BILLION ELECTRONICS CO., LTD
駿
億
電
子
股
份
有
限
公
司
HE84G761
HE80004 Series
June 30, 2003
This specification is subject to change without notice. Please contact sales person for the latest version before use.
28
V1.01
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.
MO_LIO[…] MO_PP[...]
0
0
1
1
--: Function not available.
xx: Displayable, but may have abnormal leakage current, do not use.
I/O Port
Open-drain output
Push-pull output
--
--
LCD Pin
--
--
xx
LCD Display
0
1
0
1
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