Pin Description
Pin Name
I/O
ROM Code
Option
Description
PA0~PA7
I/O
Wake-up*
Pull-high***
Bidirectional 8-bit input/output port. Each bit can be configured as a wake-up in-
put by a option. Software instructions determine theCMOSoutputorSchmitttrig-
ger input with/without pull-high resistor. The pull-high resistor of each input/output
line is also optional.
PB0/PFD
PB1~PB7
I/O
Pull-high**
PB0 or PFD
Bidirectional 8-bit input/output port. Software instructions determine the CMOS
output or Schmitt trigger input with/without pull-high resistor. The pull-high resis-
tor 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.
PC0/TMR0
PC1~PC4
PC5/TMR1
I/O
Pull-high*
Bidirectional 6-bit input/output port. Software instructions determine the CMOS
output or Schmitt trigger input with/without pull-high resistor. The pull-high resis-
tor of each input/output line is also optional. PC0 and PC5 are pin shared with
TMR0 and TMR1 function pins.
PF0/INT
I/O
Pull-high*
Bidirectional 1-bit input/output port. Software instructions determine the CMOS
output or Schmitt trigger input with/without pull-high resistor. The pull-high resis-
tor of this input/output line is also optional. PF0 is pin shared with the INT func-
tion pin.
OSC1
OSC2
I
O
Crystal
or RC
OSC1, OSC2 are connected to an RC network or Crystal (determined by 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.
VSS
Negative power supply, ground
VDD
Positive power supply
Note:
* Bit option
** Nibble option
*** Byte option
Absolute Maximum Ratings
Supply Voltage...........................V
SS
0.3V to V
SS
+6.0V
Storage Temperature............................ 50 C to 125 C
Input Voltage..............................V
SS
0.3V to V
DD
+0.3V
Operating Temperature........................... 40 C to 85 C
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-
ity.
HT48RA1/HT48CA1
Rev. 1.00
3
June 25, 2004
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