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參數(shù)資料
| 型號(hào)： | HT1623 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | RAM Mapping 48x8 LCD Controller for I/O C |
| 中文描述： | 內(nèi)存映射48x8 LCD控制器的I /業(yè)主立案法團(tuán) |
| 文件頁(yè)數(shù)： | 5/18頁(yè) |
| 文件大?。?/td> | 155K |
| 代理商： | HT1623 |
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Pad Description
Pad No.
Pad Name
I/O
Description
1
CS
I
Chip selection input with pull-high resistor. When the CS is logic
high, the data and command read from or written to the HT1623
are disabled. The serial interface circuit is also reset But if the
CS is at logic low level and is input to the CS pad, the data and
command transmission between the host controller and the
HT1623 are all enabled.
2
RD
I
READclockinputwithpull-highresistor.DataintheRAMofthe
HT1623 are clocked out on the rising edge of the RD signal. The
clocked out data will appear on the data line. The host controller
can use the next falling edge to latch the clocked out data.
3
WR
I
WRITE clock input with pull-high resistor. Data on the DATA
line are latched into the HT1623 on the rising edge of the WR sig-
nal.
4
DATA
I/O
Serial data input/output with pull-high resistor
5
VSS
Negative power supply, ground
6
OSCI
I
The OSCI and OSCO pads are connected to a 32.768kHz crystal
in order to generate a system clock. If the system clock comes
fromanexternalclocksource,theexternalclocksourceshouldbe
connected to the OSCI pad. But if an on-chip RC oscillator is se-
lected instead, the OSCI and OSCO pads can be left open.
7
OSCO
O
8
VDD
Positive power supply
9
VLCD
I
LCD operating voltage input pad.
10
IRQ
O
Time base or watchdog timer overflow flag, NMOS open drain
output
11, 12
BZ, BZ
O
2kHz or 4kHz tone frequency output pair
13~15
T1~T3
I
Not connected
16~23
COM0~COM7
O
LCD common outputs
24~71
SEG0~SEG47
O
LCD segment outputs
Absolute Maximum Ratings
Supply Voltage.............................. 0.3V to 5.5V
Storage Temperature................. 50 C to 125 C
Input Voltage................V
SS
0.3V to V
DD
+0.3V
Operating Temperature .............. 25 C to 75 C
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maxi-
mumRatings maycausesubstantialdamagetothedevice.Functionaloperationofthisdevice
at other conditions beyond those listed in the specification is not implied and prolonged expo-
sure to extreme conditions may affect device reliability.
HT1623
5
April 21, 2000
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