參數(shù)資料
型號(hào)： HT49R50
廠(chǎng)商： Holtek Semiconductor Inc.
元件分類(lèi)： 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)： 6/59頁(yè)
文件大?。?/td> 339K
代理商： HT49R50
Pin Description
Pin Name
I/O
Options
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
configured as a wake-up input by options. PA0~PA3 can be con-
figured as a CMOS output or NMOS input/output with or with-
out pull-high resistor by options. PA4~PA7 are always
pull-high NMOS input/output. Of the eight bits, PA0~PA1 can
be set as I/O pins or buzzer outputs by options. PA3 can be set
as an I/O pin or as a PFD output also by options.
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 options.
VSS
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 options. 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 options) for the internal system clock. In the case of RC op-
eration, OSC2 is the output terminal for 1/4 system clock.
RES
I
Schmitt trigger reset input, active low
HT49R50
6
October 22, 1999
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