HT49C10 Datasheet, PDF (5/47 Pages) Holtek Semiconductor Inc – 8-Bit Microcontroller

HT49C10
Pad Description
Pad No.
Pad Name
I/O
Mask
Option
Description
PA0~PA7 constitute an 8-bit bidirectional input/ out-
put port with Schmitt trigger input capability. Each
45
46
47
48
1~4
PA0/BZ
PA1/BZ
PA2
PA3/PFD
PA4~PA7
I/O
Wake-up
Pull-high
or None
CMOS or
NMOS
bit on port can be configured as wake-up input by
mask option. PA0~PA3 can be configured as CMOS
(output) or NMOS (input/output) and with or without
pull-high resistor by mask option, PA4~PA7 always
pull-high and NMOS (input/output). Of the eight bits,
PA0~PA1 can be set as I/O pins or buzzer outputs by
mask option. PA3 can be set as an I/O pin or a PFD
output also by mask option.
5
6
7
8~10
PB0/INT0
PB1/INT1
PB2/TMR
PB3~PB5
PB0~PB5 constitute a 6-bit Schmitt trigger input
port. Each bit on port are pull-high resistor. Of the six
bits, PB0 can be set as input pin or external interrupt
I
¾
control pin (INT0) by software application. PB1 can be
set as input pin or an external interrupt control pin
(INT1) by software application. While PB2 can be set
as input pin or timer/event counter input pin also by
software application.
11
VSS
I
¾
Negative power supply, GND
12
VLCD
I
¾
LCD power supply
13~16 V1,V2,C1,C2 I
¾
Voltage pump
20
19~17
SEG18/COM3
COM2~COM0
O
1/3 or 1/4
Duty
SEG18 can be set as segment or common output driver
for LCD panel by mask option. COM2~COM0 are out-
puts for LCD panel plate.
21~38 SEG17~SEG0 O
¾
LCD driver outputs for LCD panel segments
39
OSC4
40
OSC3
O
I
¾
Real time clock oscillators
41
VDD
¾
¾
Positive power supply
42
OSC2
43
OSC1
OSC1 and OSC2 are connected to an RC network or a
O Crystal or crystal (by mask option) for the internal system clock.
I
RC In the case of RC operation, OSC2 is the output termi-
nal for 1/4 system clock.
44
RES
I
¾
Schmitt trigger reset input, active low
5
September 28, 1999