HT48CA3 Holtek Semiconductor Inc, HT48CA3 Datasheet - Page 2

• Manufacturer Part Number: HT48CA3
• Description: 8-Bit Remote Type MCU
• Manufacturer: Holtek Semiconductor Inc

Pin Assignment
Pin Description
Note:
Rev. 1.40
RES
PA0~PA7
PB0/PFD
PB1~PB7
VSS
PC0/TMR0
PC1~PC4
PC5/TMR1
PF0/INT
VDD
OSC1
OSC2
Pin Name
* Bit option
** Nibble option
*** Byte option
I/O
I/O
I/O
I/O
I/O
O
I
I
PB0 or PFD
ROM Code
Pull-high***
Pull-high**
Wake-up*
Pull-high*
Pull-high*
Option
Crystal
or RC
Schmitt trigger reset input, active low.
Bidirectional 8-bit input/output port. Each bit can be configured as a
wake-up input by a mask option. Software instructions determine the
CMOS output or Schmitt trigger input with/without pull-high resistor. The
pull-high resistor of each input/output line is also optional.
Bidirectional 8-bit input/output port. Software instructions determine
the CMOS output or Schmitt trigger input with/without pull-high resis-
tor. The pull-high resistor of each input/output line is also optional. The
output mode of PB0 can be used as an internal PFD signal output and
it can be used as a various frequency carrier signal.
Negative power supply, ground
Bidirectional 6-bit input/output port. Software instructions determine
the CMOS output or Schmitt trigger input with/without pull-high resis-
tor. The pull-high resistor of each input/output line is also optional. PC0
and PC5 are pin shared with TMR0 and TMR1 function pins.
Bidirectional 1-bit input/output port. Software instructions determine
the CMOS output or Schmitt trigger input with/without pull-high resis-
tor. The pull-high resistor of this input/output line is also optional. PF0
is pin shared with the INT function pin.
Positive power supply
OSC1, OSC2 are connected to an RC network or Crystal (determined
by hardware option) for the internal system clock. In the case of RC op-
eration, OSC2 is the output terminal for 1/4 system clock.
2
Description
HT48CA3
July 16, 2003