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KING BILLION ELECTRONICS CO., LTD

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HE84G762B

HE80004 Series

June 1, 2004

V0.92

This specification is subject to change without notice. Please contact sales person for the latest version before use.

Reset

If the dual clock mode is used, the LCD display, Timer1 and Timer Base will derive its clock source from

slow clock while the other blocks will operate with the fast clock.

13. General Purpose I/O

There are three dedicated general purpose I/O port, PRTC, PRTD and PRT10, while PRT15[1..0] and

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. The hysteresis level of Schmidt

trigger is 1/3 VDD.

VDD

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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