King Billion Electronics Co., Ltd
HE84G770
駿 億 電 子 股 份 有 限 公 司
HE80004H SERIES
Pin Name I/O
Description
COM drivers or SEG drivers can be selected by mask option MO_COM[1..0]. Please refer
to LCD driver configuration for details.
SEG[79..72]/
O LCD segment SEG[79..72] outputs share pads with data bus D[7..0] of external memory.
D[7..0]
SEG[71..48]/
A[23..0]
LCD segment SEG[71..48] outputs share pads with address bus A[23..0] of external
O
memory.
Output Enable control of external memory shares pad with SEG[47]. The function of the pin
is selected by mask option MO_ EXMEM.
OE/SEG[47]
WE/SEG[46]
CS0/SEG[45]
CS1/SEG[44]
O
When used as Output Enable control pin, this pin control the tri-state buffer of external
memory data bus.
Write Enable 0 of external memory shares pad with SEG[46]. The function of the pin is
selected by mask option MO_ EXMEM.
O
When used as Write Enable control pin, this pin controls Write Enable input of the external
memory device.
Chip Enable 0 of external memory shares pad with SEG[45]. The function of the pin is
selected by mask option MO_ EXMEM.
O
When used as Chip Enable control pin, this pin select or de-select the external memory
device based on the address been accessed.
Chip Enable 1 of external memory shares pad with SEG[44]. The function of the pin is
selected by mask option MO_ EXMEM.
O
When used as Chip Enable control pin, this pin select or de-select the external memory
device based on the address been accessed.
Chip Enable 2 of external memory. This pin select or de-select the external memory device
CS2
CS3
O
based on the address been accessed.
Chip Enable 3 of external memory. This pin select or de-select the external memory device
O
based on the address been accessed.
LCD segments share pads with key scan out SCNO[19..0]. The key scan function of these
pins can be disabled by mask option clearing MO_LCDKEY to ‘0’, then SGKY[43..24]
SGKY[43..24]
O
function as LCD segment driver only. Setting MO_LCDKEY to ‘1’ will turn on the key scan
function.
8 bits bi-directional I/O port 14 are shared with LCD segment pads SEG[23..16]. The
function of the pad can be selected individually by mask options MO_LIO14[7..0]. (‘1’ for
LCD and ‘0’ for I/O).
PRT14[7..0]/
SEG[23..16]
B/
The output type of I/O pad can also be selected by mask option MO_14PP[7..0] (1 for
O
push-pull and ‘0’ for open-drain).
As the output structure of I/O pad does not contain tri-state buffer. When using the I/O as
input, “1” must be outputted before reading.
8 bits bi-directional I/O port 15 are shared with LCD segment pads SEG[15..8]. The
function of the pad can be selected individually by mask options MO_LIO15[7..0]. (‘1’ for
LCD and ‘0’ for I/O).
PRT15[7..0]/
SEG[15..8]
B/
The output type of I/O pad can also be selected by mask option MO_15PP[7..0] (1 for
O
push-pull and ‘0’ for open-drain).
As the output structure of I/O pad does not contain tri-state buffer. When using the I/O as
input, “1” must be outputted before reading.
8 bits bi-directional I/O port 17 are shared with LCD segment pads SEG[7..0]. The function
of the pad can be selected individually by mask options MO_LIO17[7..0]. (‘1’ for LCD
and ‘0’ for I/O).
PRT17[7..0]/
SEG[7..0]
B/
The output type of I/O pad can also be selected by mask option MO_17PP[7..0] (1 for
O
push-pull and ‘0’ for open-drain).
As the output structure of I/O pad does not contain tri-state buffer. When using the I/O as
input, “1” must be outputted before reading.
October 31, 2003
6
Version:V1.1
This specification is subject to change without notice. Please contact sales person for the latest version before use.
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