參數(shù)資料
型號(hào)： HT49C50
廠商： Holtek Semiconductor Inc.
元件分類： 8位微控制器
英文描述： 8-BIT MICROCONTROLLER
中文描述： 8位微控制器
文件頁(yè)數(shù)： 6/52頁(yè)
文件大小： 318K
代理商： HT49C50
Pin Description
Pin Name
I/O
Mask
Option
Description
PA0/BZ
PA1/BZ
PA2
PA3/PFD
PA4~PA7
I/O
Wake-up
Pull-high
or None
CMOS or
NMOS
PA0~PA7 constitute an 8-bit bidirectional input/output port
with Schmitt trigger input capability. Each bit on port can be
configuredasawake-upinputbymaskoption.PA0~PA3canbe
configured as a CMOS output or NMOS input/output with or
without pull-high resistor by mask option. PA4~PA7 are al-
ways pull-high NMOS input/output. Of the eight bits,
PA0~PA1 can be set as I/O pins or buzzer outputs by mask op-
tion. PA3 can be set as an I/O pin or as a PFD output also by
mask option.
PB0/INT0
PB1/INT1
PB2/TMR0
PB3/TMR1
PB4~PB7
I
PB0~PB7 constitute an 8-bit Schmitt trigger input port. Each
bitonportarepull-highresistor.Oftheeightbits,PB0andPB1
can be set as input pins or as external interrupt control pins
(INT0) and (INT1) respectively, by software application. PB2
and PB3 can be set as an input pin or as a timer/event counter
input pin TMR0 and TMR1 also by software application.
PC0~PC3
I/O
Pull-high
or None
CMOS or
NMOS
PC0~PC3 constitute a 4-bit bidirectional input/output port
with a schmitt trigger input capability. On the port, such can be
configured as CMOS output or NMOS input/output with or
without pull-high resistor by mask option.
VSS
I
Negative power supply, GND
VLCD
I
LCD power supply
V1,V2,C1,C2
I
Voltage pump
SEG32/COM3
COM2~COM0
O
1/3 or 1/4
Duty
SEG32canbesetasasegmentorasacommonoutputdriverfor
LCD panel by mask option. COM2~COM0 are outputs for LCD
panel plate.
SEG31~SEG0
O
LCD driver outputs for LCD panel segments
OSC4
OSC3
O
I
Real time clock oscillators
VDD
Positive power supply
OSC2
OSC1
O
I
Crystal or
RC
OSC1 and OSC2 are connected to an RC network or a crystal
(by mask option) for the internal system clock. In the case of RC
operation, OSC2 is the output terminal for 1/4 system clock.
RES
I
Schmitt trigger reset input, active low
HT49C50
6
August 18, 1999
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